TESTED: NEW EC Tuner Brake
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Many of you in the Precision Rifle community have seen the new Patent Pending EC Tuner Brake from Erik Cortina, and have probably been thinking: "Does it work?". In this video, we'll find out by testing the EC Tuner Brake with three different rifles, with factory ammunition, and with handloaded ammunition.
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I have the EC tuner brake on my 6.5 RPR Creedmore, first thing I noticed, the muzzle jump was gone, and within a few minutes I was shooting 1 hole groups, so I ordered a 2nd EC tuner for my 300 PRC RPR,
Have you shot it on the 300PRC? Recoil reduction good?
@@dirklabuschagne473 I have shot it on my RPR, which comes with a huge brake from factory, the EC tuner works great to tune, with just slightly more recoil
What tune number is yours set on
@@forrestwaldeck9803 on the 6.5. I find either 4 or 6 depending on my load
Only thing missing for me is. They did not show, does that setting repeatable. One group doesn't seal the deal! They speak of it at the end. Is there a follow up video.
I have two of these and I love it when the rifle goes into tune. It doesn't make a sound when firing. When it's out of tune it's like a tuning fork going off every shot. This brake basically takes out the need to move the bullet in and out to find the seating depth the rifle likes. You can make it even smaller a group by adding that in, but really 0.2 is fine for PRS. I have had no issues with repeatability. Erik stands by his product and at F-Class and PRS matches I see a ton of EC tuners, because he makes other styles and calibers.
I'm just glad Eric's dedication and hard work is finally getting shown to more people. This whole system has come from his many year's of precision shooting into his own workshop that was specifically built to build something like this.ThankQ.TkEZ>UK
It’s a redesign of brownings BOSS is all this is.
I have Erik's EC TUNER on my 6.5X47 Lapua and cut my group size in half down to .31" shooting 140 Berger Hybrid. Then put it on my .224 Valkyre and again my group size was reduced to .30" shooting 80.5 Berger fullbore target. Reminded me of my old Browning BOSS tuner from many years ago. Thank you Erik!
I have it (in polished stainless and would rather have black) and I ran a very comprehensive test. There is no doubt that it works exactly as advertised and designed. My range was from around 3/4 moa to inside 1/4 going through the settings. My sweet spot is at "4" and it's good still at just past 3 and just short of 5.
WORTH IT'S WEIGHT IN GOLD! I threw it on did some load work up found a good load 144 Berger and H4350 SD of 2.4 on my magneto speed. Loaded up 30 rounds took the magneto speed off and started fine tuning.3 shot groups starting at 1 to 8. Found it grouped well at 4 and 5. So I split the difference and wow! 5 shot group @.18 inches and .22 inches. Absolutely amazing product.
I like your partner’s idea for swapping, taking notes and repeatability.
"The difference between science and screwing around....is writing stuff down"
It really would of made the study that much more reliable. I hope they try this.
I can almost guarantee that if this is taken off and reinstalled, that the tuning will change. I wouldn’t see this as the tuner/brakes’s fault though.
Me too.
If you put gorilla tape on the back of your target it holds the paper together really well and you can get a better idea of the group size without the tearing of the paper.
Amen. I thought I was the only OCD guy doing that lol. Now I have a shotmarker on order.
Woah definitely trying this!
Great idea, hadn’t thought of that. Definitely worth a try.
I like using the blue shop towels for this reason. Comes in a big roll of cheap durable targets.
Were do you stick the gorilla ?
I bought a EC Tuner for my Remington 700-7mm REM Mag elk hunting rifle. My results were definitely similar to yours. My three shot groups went from .815 @ 100 yds to .279” @ 100 yds. I did have a setting where my groups opened up to over 1” (1.40”) then back to my best grouping. As a side note I was using IMR-4831 powder and Nosler 160 gr Accubond bullets.
I put this ec tuner brake on a rifle that shoots amazing. I just wanted to c if I could get rid of an occasional flyer when using a bullet that actually needed a faster twist barrel. After adjusting the tuner I have completely eliminated the flyer issue. I’m very impressed with this product!!! I’ve put off getting a barrel with a faster twist.
My first example of a barrel tuner was a model 70 Winchester with a boss system, once adjusted it was amazing how much effect it had on group size with factory ammunition
Ding ding ding ding! We have a winner. I have older Winchester and Browning rifles with the BOSS installed, and they pretty much eliminate so-called "ammo pickiness". It doesn't work with everything, but the BOSS will help make your rifle "like" a much larger range of loads, and will produce groups you'll love.
Gavin i have the original Ec Tuner on my custom 6xc just like everybody i was a little skeptical to but had the gunsmith install it on a Bartlien heavy varmint on a Defiant action. All i can say is this gun is a tack drive went through some test and settled on number eight, shot a five shot group at 100 yards just under 1/4 inch group, did this test a couple more times same results, it’s made me a believer.
Great idea about taking it off and putting back on to see if results stay true.
What happens when you take your scope off and Remount it? What happens when you secure your stock screws
I started reloading this year and I have an EC tuner break on my 300 wm. The best I could get my reloads was a half inch group but by using the EC tuner I’m now shooting 1/4 inch groups. With factory ammo my gun will shoot 1 inch groups but the EC tuner will help me get them under a 1/2 inch groups. My rifle is a Christensen arms ridgeline. I have also changed the stock. With the stock change and the tuner break it kicks less than my 7mm-08. I enjoy watching your videos because you are very informative. Please keep up the good work.
A great tuner brake by a top class guy. 👍
I'm curious about conistancy. Maybe firing 3 groups per setting then averaging them. That way you don't get one crazy good group skewing your conclusions.
Eric Cortina is a no nonsense kind of guy. Definitely buying it.
Maybe take a factory rifle with factory bullets and test it.
He didn't even place in top ten at national s did he. 2021?
@@treece1 maybe he doesn't get enough range time, he's a business owner
Another killer aspect of tuner is if you run data in temp changes and record it, you can tune load in colder/warmer weather. I run a 6.5 Lapua for PRS and it works. Without having 2 different loads.
I dont have one yet. And was wondering if that could be tested. Awesome info.
Bought an EC tunner for my 6.5 cm. My biggest surprise was reduction in recoil. I was surprised it has less recoil than my suppressor ( Gemtech 300 win mag). My last 3 shot group was .218
LOL, well, it is a muzzle brake.
Could you see the bullet trace down range after the break. My daughters are learning prs and I need them to be able to see the trace.
I would be interested in seeing the additional three or five-shot groups to see if the results are actually consistent and remain improved over time.
Bingo.
Also wonder if it's repeatable. Could you get it dialed, go back a bit, end on your number, and have the same POI / Group.
Statistics of distribution do not favor barrel tuners. Two 30 shot groups, one without tuner and 1 with the tuner in a “node” could tell us definitively if the tuner works, but I’ve never seen this done.
Bought one of these for my .338LM. Worked amazing, love it. Loved it so much I just ordered another one for my 6.5CM. And I can't wait to see how much it changes things on an already great shooting rifle.
Easiest thing to do would be to have a tuner for each rifle. But, I like the repeatability idea for those on a budget and want, or are limited to, that capability. I'm a fan of Erik and have learned a lot from his channel.
He's got a lot going right now and yes I've learned alot from him to very smart man
"Keep'em centered!" EC
Years ago I HAD 3 Winchester Boss System rifles, 243, 300 Win, 7mm mag. Each shoot 1/3 MOA. Sold them along the way..... About time someone came out with a Boss style system. I'll buy a few dozen.
Would love to hear a follow up regarding removing it and demonstrating repeatability!
I bought one, for my 300 BO with a 16"BBL. on a Unitau Precision Upper. it hates boat tail bullets. With 168 gr A Max. Just the break cut the groups in half with no adjustment.
This is the interesting and fun part of marksmenship. Thank you.
I know this is 3 years old, but EC and others need to thank Winchester / Browning because this is basically the 2020 version of the early 1990's BOSS system. And it worked like a champ back then even though folks said it looked stupid on the end of a barrel.
I inherited a browning ab2 .270 with the boss break on it. After shooting a 3/8” group 4 times, i really wanted to get a boss break for my other rifles, but found out that browning discontinued them. I am very happy to see the EC tuners are basically the same thing and work well. My savage 22-250 is about to be stupid accurate lol.
270 stomps ass, especially when loaded right, to it's full potential, absolute favorite all round cartridge, then the 7rm mg, ballistics are impeccable
@@travisweldmaster7815 I want to add a 7mm someday, but since I handload my rifles, I may get crazy and go 7 SAUM. Why it hasn’t caught on commercially despite being an F class King is a complete mystery to me.
@@fnkdtnk yeah no doubt it sure is, I custom built this one, off a savage action bull 416 barrel fast twist choate stock, was my first real precision build, If i could go back I would go saum too just because the belt can be annoying, the 280, an ai's an saums def rule f class, I load also my go to for that 7 is 168 ablr at 3150 fps, loaded out to almost 3.5 inches, nothing bad to say about any 7mm cartridge really...even 08 isnt bad, well comparably no but alongside most it does well the .284, .277 and smaller, I find you really have to push 30 cal really fast to not lob mortars like 308 lol I like 308 for fun just because it's so ballistically INEFFICIENT for a scope track challenge lol, ol slow and heavy is fun to pull out every now and then 175smk 42.5g sw pr 2650fps, 1 hole groups, basically a tuned federal gold medal factory load
@@travisweldmaster7815 my uncle in law is an avid hand loader and long range shooter. He recently parted with his 7mm rem mag specifically because he hated having to seat it to the belt instead of the shoulders. He had a 280 rem turned into a 280 ai and loves the thing.
I shoot 165 ablr’s out of my 30-06, and it is a mortar as well, but its strictly a hunting rifle, so I don’t shoot it far enough to really care. My .270 has swift scirricos, and they are about used up. I may swap it to ablr’s too, though I’ve heard great things about the eld-m’s, and they are significantly cheaper,
@@fnkdtnkI gotcha, nothing wrong with that, to each his own, I headspace off the shoulder to head like any other, like the belt isnt even there, no problems, but everyone's setup isnt always the same
I had a 6.8 SD but a.67" group. Added the EC-TUNER and got to setting "6"! One fricking hole! 😎
That is exactly what mine did, 6 was a one hole group. 6 Creedmoor.
Yessir, same experience I had...love it!
Just bought an EC tuner brake. I’m having it installed now. Can’t wait to try it out. My best 5 shot group from my .308 is .478 with Federal premium 168 BTHP. This video has me really excited to see how much tighter my groups can get.
Have you had a chance to test it?
@@BLUELEADER78 I did a lot of shooting and testing this month. The EC Tuner brake did a fantastic job. I did most of my testing with Federal premium 175 bthp ammo. I did some testing with 168 and was able to tighten the groups down to .365 for a five-shot group. I ran out of 168 and switched to 175 BTHP. Before the EC brake my rifle would shoot the 175 in the 3/4 moa range very consistently. I started firing 2 shot groups at 0 going in increments of 2. At setting 2 they were touching but I continued on all the way back to 0 being 10. Setting 2 and 8 were both touching. 8 was very slightly tighter. I dropped back to 7 and went in half step adjustments. At 7 it had opened up to about 1/2", 7.5 was about the same, skipped 8, 8.5 was almost 1 hole but I could see it was 2 shots. Setting 9 was 1 hole, I couldn't tell through my spotting scope that 2 shots were there. I sent 3 more making it a 5 shot group. Subtracting the .308 for the bullet diameter the group measured .210. Thats a .518 hole with a .308! Wow, factory Remington 700 PSS .308 26" 1:12 twist with a Timney trigger and an EC Tuner brake is shooting factory ammo sub 1/4 moa !! Will it do it every day, probably not but that remains to be seen. I can say that I am a 100 percent believer in the EC Tuner brake.
Have a 7PRC will be installing a EC tuner brake!...I will send you my results when I have them...Good stuff guys thank you
I picked one up a while ago and it works wonders on my rifles! It saves me a lot of time and money so I don't have to play around with bullet seating depth especially when getting components are hit and miss.
I have the 30cal brake i swap on 6cm 6.5cm and 6.5-300bee. Set to original settings and it stays true. Takes half of the work out of load development. Erik makes an amazing product.
I was wondering if the 30 cal brake would be effective on lower caliber rounds, that is how well it would work to reduce recoil and tune .280 and .270 cal rifles. Sounds like it works on your rifles.
For those weary of the tuner brake; buy one and install it as if it were a standard brake. Develop a load conventionally with a powder and seating depth node that shoots well. When you go to a match and your groups start opening up because of throat erosion or change in temperature/pressure, you can adjust your tuner on the fly as a backup.
I think this thing can cut your load development time in half. It would be so nice to find a powder charge with low sd and then you could essentially finish your load development in 1 day at the range as opposed to making a bunch of trips back to your reloading bench
Yes, I use the EC tuner with a 6.5 PRC currently worthing with a load. The rifle is a new MPA with factory match bullets it shot well 1/2 with the turner .119.
I used the 30 caliber EC Tuner Brake on my 700 Remington CDL 7mm Remington Magnum and the difference was worth every penny spent. Results on my hand loads- three shot groups starting 0.78” we shrunk to 0.19” which essentially was one button hole. Never look back!
I have the EC tuner brake and I generally find a very good node (tight groups) within the first revolution. It takes me probably 15 shots (3 shot groups at every second mark) to find a node. I then confirm that with another 5 shots = 20 shots altogether.
I have an EC TUNER PN A 40 cal muzzleloader. It truly does make a difference!
I just got back from the range. I have the EC..2 tuner break, and it's amazing. I'm getting ready for hunting .
I loaded with no load development. I used 40 guns of Varget, under a Berger 175 grn vld hunter.
At setting 8 I got.25 inch group at 100.
I tried 7 and it opened up to 3/8".
I went to 8+ and it shrunk the group to 0.029 ,3 shot group. No load development.
I'm good for in the bush where my longest shot will be just over 200 m over a pond.
Use the tuner brake on my prs 22 br. 95 gr smk, h4350. Last group on paper was measured at .281-.224=.057 for 5 shots. Consistently shoots from .2-.0. Best shooting equipment I've bought!
I've had a stainless Winchester model 70 in 30-06 for over 25 years. It came with the BOSS system...and was apparently way ahead of it's time. It is the same principle as this - a brake with a tuner. It's a shame it was discontinued. I dialed it in for factory 150gr loads when I first got it and it shot 1/2" groups...and it has shot them continuously since then.
@Phil Ward It was at the end of the barrel...very similar to the EC system.
I tuned mine for 168s and has been fantastic for years as well. No need to buy another rifle since. Have about 800 rnds through it now, so there's plenty of life left in it. My buddies that shoot it can't believe that the '06 could be that accurate. It can.
I didn’t know Winchester had the boss system I have only seen it on brownings I thought it was special to them.
@@dbuckner902010 Winchester and Browning are both owned by the same.
I have a EC tuner on my Vudoo. So worth the money.
Would love to see you do the tuner adjustment as shown. Then shoot a 20 shot group with the best and worst settings. Also, as others have said step back through the adjustment a 2nd time and see if you land on the same settings for best and worst groups.
YES! Definitely test taking the EC Tuner off of the rifle, messing with the setting and then remount and set back to desired setting. I'd love to see that tested. I'm an Eric Cortina fan because he clears the muddy water stirred up for us who have less knowledge, he backs it up with proof
Gavin the EC TB works very well
Yeah,I put a brake on a 25 WSSM AR.IT went from 1/2 “ groups to 1 1/2” or worse.Took the brake off,tightened up.So I have a EC TUNER brake on order .Hopefully it will not let me down
I have his EC Tuner Break in 308 and 6.5. shot a 3 shot 308 group tuned to #7 on the break.... Hole diameter was .398 on the target. Still working load data for the 6.5. Love the breaks
I use the EC tuner break, and I like what it does for my Aero Precision Solus.
I did not read many comments but i am sure others have commented that this isnt anything new. Browning came out with the b.o.s.s way back in the 90's. It was a tunable muzzle brake option.
Funny how old things suddenly become new. This is a good example.
Now i need to work on that tunable suppressor mount and patent it.
Maybe an 1.128" long 5/8x 24 thread tenon and matching jam nut. Lol
Browning used to have what they called the B.O.S.S. It worked great. I have a Browning Abolt in 270 WSM with a Boss on it and will shoot sub moa all day long, once i got it fine tuned.
Yes area 419 hellfire self timing muzzle system groups are a lot tighter shooting 338 300 grain bullet can't wait push this out pass a mile.
This sounds like the product I may need. I had a load that consistently shot .5” inch groups at 100 yards with single digit ES/SD. Shot a 4” six shot group at 995 yards with that load. Then I ran out of powder and switched to a different lot of the same powder. For reasons I’m still scratching my head trying to figure out why the groups went to crap. I would have three touching and two fliers high and low. However, the velocity node stay the same with single digit ES/SD at the same charge weight. The velocity did drop approximately 50 fps though.
I also developed a load for a couple 308 rifles that have BDC reticles, is gas operated and the other is bolt action. The load I’ve developed runs identical ES/SD in both rifle, low teen ES and single digit SD, and the ballistics match the BDC reticle. The bolt gun shoots a consistent .5” five touching group at 100 yards, but the gas gun shoots .8”. I imagine this brake may shrink those gas gun groups down some more.
When taking it off and putting it back on i would try and use a crows foot on a torque wrench to make sure the tightness to the muzzle is the same to remove another value from testing.
Bingo! Any ideas on how to ensure consistent timing?
you really need to confirm those results with more than a single group
Yeah a 3 shot group only gives a 20% confidence interval for being within standard deviation interval.
Thanks for a very interesting and practical experiment. Currently there is not a temperamental rifle in my safe, however if I do have issues the EC Tuner will be part of my solution.
Good series with the two guys 👍 Gavin get's help from Travis 😁
i like to see if it is repeatable and accurate every time you take it off and back on the rifle..... great vid you guys!
I watch Erik Corrina's TH-cam channel. He's really funny. Plus, he has a lot of good advice for people who want to get into accurate rifles.
Gotta get one.Been waiting on EC to get his new Mill all lined out
literally the cure to accuracy! eric cortina doesn’t play around everything he sells is 100% legit . great prices and the box it comes in is super badass
What is the cost of this tuner/ brake ?
The browning Boss is just like the break. I have it on my a bolt 2 medallion 280 rem. It really works
My buddy has a tuner on his 37xc as well as a terminator muzzle brake! They absolutely positively do work , I’ve seen it first hand…
I knew I should of got on the black tuner list few months ago. Load work is done and want to see if I can get into 0.1
Tuners can help shot placement. small caliber rifles can use improvements on shot placement. It really helps when hunting, large or small game
Good video and information. Been thinking about getting a tuner.
In one of his videos about seating depth Eric himself says that you can tune "any load" just by adjusting seating depth. IOW, according to him, changing seating depth changes harmonics in a manner similar to a tuner.
very cool product. unfortunately, my tuner is a suppressor. it only has 2 settings: on and off... i prefer the "on" option!
I had great success with the predecessor Browning BOSS on rifles in past. I often wonder why Browning quit offering the BOSS?
This is the same concept as the BOSS system on the Win 70 and The Browning rifles. It works!
Very interesting. I remember Browning came out with a similar setup in 80s or early 90s I think.
Yep the BOSS-system: www.browning.com/news/tech-terms/boss-rifle-accuracy-system.html and www.browning.com/support/faq/tune-boss.html
Still available on the BAR mk2 Safari apparently
@@gusmodelmaker YES!! That was it.
I was wondering if this was different. But except for the muzzle break I guess not. Cool piece of gear for sure.
Really interesting. This subject matter has been of many topics on several LIVE show, using a "barrel tuner or not"... And it really is interesting to see so many other there building a general census for the Pro's & Con's of this. Also worth mentioning, many of these folks that are already going on with this adventure of experimenting with a barrel tuner, of various brands and types, it will be crazy interesting to see the various calibers. Something so simple, yet, exceptionally complicated. These kinda remind me of the sky-scraper tuned dampers. (the multi-ton chunk of steel at the very top of the sky scraper to calm the swaying down), yet, it is just a chunk of heavy mass, hanging from cables, all the while ever so delicately balanced or tuned to the buildings harmonics.. I look forward to trying one in the future. I am a bit away's from trying one just yet, as my skill set is still too messy, to be able to notice a difference, as per, is the P.O.I. me, or the rifle system or weather, etc.... Soon though. that will be fun to play with a few of these various types of anti-harmonic / damper units.. Thank you for showing the graphs, I enjoy that seeing that kinda stuff, it helps my mind understand further what you are saying in a 2D format.. Thank you.
Erik’s tuner works great.
One test I would like to see is to take the tuner out several rotations and see what happens if you go from zero to say 30. Is there more than one node that can be found and at what distance might that be?
Go to Erik’s site, he shows it. There will be several nodes found on running it out from zero.
I owned a Browning A bolt in 300 win magvwith the Boss system. It was awesome!
Around the 12 minute mark I really liked your questions, is there a part two to this video where you guys test repeatability and such?
I have 2 a 6.5 creed and a .308.
THESE WORK!.
The EC tuner is a great product. Need to try the. 30 can version.
it’s a great product man . i work for eric in his shop everything he sells is great .
@@cedricmendoza1305I just tried to buy one the website states out of stock , will these soon be available again ?
Respectfully, changes in 3 shot group sizes between one adjustment to another does not seem statistically significant.
I thank you for the test and the results. I will be buying one to test on my various rifles. But find it interesting you're shooting $3-5K rifle/scope setups but ran out of ammo. ;-)
I have an .30 cal EC T/B on my 6.5 Creedmoor. It is legit. And changing one parameter 100% changes the whole system. I found a setting of 8 worked awesome with my Federal primers. But shot like shit with my CCI primers. CCI settled on a setting of 16. Got just a hair under 1/4 MOA out of a custom load on a FACTORY Tikka Tac A1. Not too shabby.
I think the best strategy to use a tuner is to tune a load for minimum ES and SD, then tune the harmonic to get a small group.
When you do an OCW ladder for load development, you are tuning your load to match your harmonics, so if you tune for velocity and then for harmonics, you should be able to optimize both and find the widest node to shoot in.
100%! That is something we talked about in the vid.
Winchester BOSS accomplished this...I have this on a Model 70 in 22-250; dime -sized 3 shot groups all day. Happy to hear there is another option out there because Winchester ditched BOSS, years ago.
You just got a new subscriber mate!
I may have missed it, but it would be nice to hear if the brake portion of the tuner brake is effective also. I am on the fence now and don't like the brake on my current setup. Keep the great videos coming.
My feeling is as a brake it is very good.
Sounds like a Browning BOSS/Muzzle Brake. Love'm. Delivers .5 MOA on my skinny barrelled 30-06 A-Bolt
Can we get a follow up on the repeatability of settings after swapping it around? Also, could we get maybe 4 or 5 3 shot groups rather than singles? It’s all well and good to see the thing work in concept, but increasing the sample size to show those initial findings actually hold up would be valuable for know whether this is a product worth purchasing.
It sounds like the ECTuner device will help shooters realize the full potential of their rifle. Certainly, there is no easier or less expensive way to experiment with extracting the most out of a group of components, before making more radical changes.
Have one sitting on the shelf right now. Going to try it on my 6mm arc when I finally get the upper. (Of course do a baseline test with original brake first.) Haven't heard of anyone trying them on gas guns. Guess there's only one way to find out.
That is the constant with shooting. Working so dam hard to find a group and have a single determining factor that can blow You out of the water.
I have 2 of Eric tuner and i love it
I'm liking it definitely going to be picking one up soon!!!
Got mine the other day, shooting tomorrow!
Let me know how it goes!
@@Ultimatereloader I'm in the process of load development for my 6.5 PRC build. I narrowed down the powder, charge and seating depth. All that was left was tuning the group. Initially it was a .337 group at 100 yards. As I tuned it went down to .149 and then increased out to almost .5. I went back to the best setting (4) and shot a 5 shot group at 300 yards, .262! I'm ordering one for my 7mm
Erik’s advice is to look for two small groups in a row when testing the brake.
Interesting. Browning/Winchester did this years ago. No one liked except me. It made perfect sense but the bubbas balked at it. It just looked different & took some effort. But it worked!
I'd very much like to know the repeatability. as I have and mostly use a supressor and want to get this for some club matches. the idea of being able to remove and replace without reworking up loads is very appealing so repeatability is key to me wanting it
Eric is the man. He designed it and says it works you can bet ur bottom dollar IT DOES
Great video guys the EC tuner brake sounds like a good idea and I think I'll give it a try one thing though you never mentioned how well it helps on recoil and if I'm not mistaken you use it only on a Mac grade barrel well how well will it work on a factory barrel would be nice to know and see the results well keep testing hope everything goes well and everything stays in the bullseye I like all your videos good going thank you for information that I might be able to use
The EC tuner and brake looks nice and light. I've been using the Harrell's Precision tuner brakes for a few years now. I also have two Browning rifles with the older BOSS brakes. One downside of the Harrell's is their weight, so not something to put on a rifle that you want to keep as light as possible. For bench rest shooting, hunting and nuisance varmint hunting, I have seen great results with the Harrell's brakes. However, I have never taken one off and then put it back on for repeatability. I've always installed the brake, tuned it and then locked it in place with judicious application of blue Locktite. I learned to take shooting notes in the US Army, and track my reloading, and shooting so I can tell where the sweet spot is with my loads.
you definitely need to try it out the Ec brake is great
I've got a ruger mk77 all weather 7mm rem mag I had a BOSS brake put on it back in the late 80's I still love it
Reminds me of the Browning Arms BOSS System, which unfortunately Browning Arms dose not catalog anymore.