Sustained Fire & Barrel Life - Rex Reviews
ฝัง
- เผยแพร่เมื่อ 10 ต.ค. 2024
- How many rounds can you shoot at a time before you have to worry about throat erosion in your rifle bore? How many rounds do you have to shoot before the barrel is too hot? What cartridges are most erosive on the bore? In this video, Rex explains the proportional relationship of cartridge dynamics in terms of throat erosion and expected bore life.
Thank you for your donations to the Rex Reviews Project! We hope these videos continue to be a great help to you all.
All the music in this video was created by TiborasaurusRex, an unsigned artist.
Song Titles: Particle Jam, Dawn of the Day, Wadi Watir, and Under The Ice
Music and Lyrics by: TiborasaurusRex
Instrumentation and Vocals by: TiborasaurusRex
Recorded by: TiborasaurusRex
I want to thank you. I'm nonmilitary, 45 year old son of country folk. I could kill deer all day long but 300 yards out I was lucky to hit a torso size target. After humbling myself and watching your sniper 101 series this old dog has now been able to hit 8inch groups at 600. While everyone can laugh this is a huge improvement for me personally and I'm keeping at it. Keep up the great work!
If you were like me, I was never taught to shoot really. We would go out with a hunting reticle and shoot basically point blank. I would never figure out really what to do at longer ranges. I think a quality scope with mildots and or adjustable turrets is very helpful.
Thats a fantastic group depending on the equipment and ammo used sir. Keep it up!
Dude that's awesome. Keep truckin'.
Rex I said it once ill say it again you are a BLESSING to the community , you are the MAN
Home of The Brave I must respond, Rex is defiantly righteously sent, A saint sent to help wake up The sleepers ever reminding us till the Prince of Peace comes we all must prepare by armoring up, Great Book in one hand/mind and the sword in the other, God bless to Rex And all the like minded sheep dogs that Father has sent!!! Cheers......!
Love the info , thank you
The way i see it, the flatter shooting the caliber, the higher the chances for throat erosion at sustained fire. Because you pointed out all the ones with higher velocities. Basically, 3000 fps and faster could burn out a barrel pretty quick. Depending on how you use it of course.
Crazy how often I find myself browsing Rex's channel. My wife even knows Rex. LOL. Weird how someone from TH-cam can almost become like family when you watch enough of their content.
Love the videos rex! Happy to see you back up and healthy brother! Been watching the videos for years now and have learned a lot of my long range shooting info and skills from your videos! Look forward to what's coming up next! Love the new logo too!
Thanks for clearing up this question for me. You're a great teacher.
dude that is awesome I listen to you videos on the way to work which is about an hour drive thanks for all the material it is truly entertaining and informative thanks a lot Rex
I sent TR a message and in this video he answered my question indirectly (as I'm sure he did for many others). Always entertaining and always educational.
Yep dude, love the informative quality of your vids, whether shooting, scopes, ballistics studies etc...always look forward to them and always end up envious...😉
Our Training Schedule: www.rexdefense.com
Ah man, I would love to go to this!
Good video ,with cartridge design a good balanced shape is essential, that's why cases like 30-06,223,222 and 50bmg are so successful, they are about at there limit before overbore becomes apparent and the law of diminishing returns comes into play .That is why the weatherby rounds never caught on ,ie burning masses of powder for a little gain in velocity and short barrel life.
222 for the win
Hell yeah brother! You couldn't have picked a better first topic for your pod cast. Myself and many others have waited years for the scope brand topic. Glad to see you posting regularly also. Great music and great info. If you go itunes for the pod cast you should put some of your tracks up there for us to buy too.
Thanks so much for this, man! This is the pithiest and most helpful discussion on the subject I've ever heard, and you've clarified something for me. I'd wanted my next LR rifle to be chambered in .243 Win because of its relatively high BC, and it also happens to be readily available and inexpensive where I live (VT). Other cartridges with better BCs tend to be more expensive here and are harder to find. But I've heard some guys say that barrel life is really short for a .243, like
Ya, I had the same worries about the 243. But I built a target gun off a savage target action, which had a 243 barrel on it. I thought, wth, I'll shoot this barrel out then re- barrel it with either 6.5 CM or even a 7-08. Funny thing is, even with factory savage barrel. I've put through well over 1500 rounds in 2 years. And it still shoots lights out!
I use it mainly for a log range coyote gun, so not alot of sustained fire. But I also have gongs set out to 1000 yards at my perch where I shoot from. I actually shoot from my uncles old farm house that's abandoned now. I set up a shooting table facing out a second story window, with a good 2 kilometer view of the prairie landscape. So when it's -30 up here, a couple propane heaters and I've put many a coyotes to sleep at some good ranges. But that 243 is still chugging along. I might just rebarrel it with another 243 when the time comes.
I Love the "grab a camera, say something, show something, and upload something". I don't need all of the Fancy Production Stuff to Watch, Learn and Enjoy Cool Stuff! That's the way TH-cam used to be & got people to watch in the first place! I Appreciate the Work & Trouble You Guys go through to make the High Quality Production Videos, but a "Thumbs Up" is still a "Thumbs Up!" I'm looking forward to the Podcast! Thanks Much!
Rex is the Bill Nye of the gun community.
Except Rex is not a political hack, who pretends to be someone he's not.
why would you insult him like that?
DrTraitorfield Bill-bob Nye is a political hack, TV actor and professional nitwit!
Are you mad because he doesn't believe in god???
Bob Dobalina What are you going on about? ???
I stated facts about Billy boy the TV presenter and actor who has been spreading propaganda on so-called global warming.
I don't know anything about his religious beliefs and couldn't care less.
Very informative. I love your videos Rex. Best long range info stop on TH-cam!
I've really become a huge fan of 7.62x39 and 54r for getting out and shooting a lot. Norinco and Finnish M39. Those things will shoot all day and are tack drivers. Thanks for the useful information, it assures me I picked good on common use calibers
Thanks, I have been thinking along the same lines. That is why my, things go off the rails guns, are 308, 338 and 50 cal and working on my 675.
Good information. I enjoy "geeking out" on your videos! Keep'em coming and I'm looking forward to seeing more. BTW....noticed you're looking healthier and it's good to see!
Excellent video. Thanks for all your terrific insights. I'm a real fan of your channel.
Excellent. I always learn a ton. Thanks, Rex!
As always Rex.... great information!!!!
I love this channel brother!!! Thanks for the great information.
Comparing the 243win with the 6mm Rem (formerly 244 Rem.)... Both cases have about the same powder capacity (the 6mmRem can hold a few more grains than the 243win.) and of course the same bore diameter, but general consensus is that the 6mmRem. barrel life is much longer than the 243's.
The biggest difference between the 2 cartridge designs is the length of the neck. The 6mmRem's neck is much longer than the 243's and it's speculated that the longer neck helps to shield the throat from some of the torching.
it seems to me that the shoulder angle combined with the length of the neck makes a big difference. the shoulder angle will push gases at that angle and if the neck is too short the angle will result in the gas directly hitting the throat
great video! would you please do a quick video on pros and cons of rifling groves. whether 4 groves is better than 6 and so on. also I am curious about the pros and cons of button rifling, cut rifling, polyhexagonal rifling and so on. thank you for your time, keep up the great work
Thanx so much for sharing all your knowledge Rex, has helped me a lot in making hunting and long range decisions
Yes you are the man....
One thing that helped stave off the throat erosion in the M2, M1919, and M60's was that the chamber and first few inches of barrel were actually a stellite (High quality, aircraft / suppressor application super alloy) liner which was extremely wear and heat resistant.
Excellent commentary, sir. Thanks for participating.
Great video bud. Lots of good info. Only the biggest culprits for throat erosion are pressure and friction. But mostly pressure. The numbers will be different for each cartridge and each load. And sustained fire of course. But the heat from the powder itself will probably only contribute to 5% of the erosion. Maybe even less. It’s good info to know. That’s why barrels burn out faster at the throat. That is where the pressure spikes the highest. As the bullet travels down the barrel, the pressure drops rapidly. Making the muzzle end last much longer.
True info for conventional barrels, but here on the army side, throat erosion may be good, but gas port erosion is where we see it.
Oh man! Can't wait for those podcasts. I'm using vortex PST and I have a feeling i'm gonna get punch to the gut by Rex.
Kudos to the man that taught me to shoot Long Range, which I've yet to meet
Good job Rex, you've taught me how to Fish sort off. As Confucius said."Give a man a fish, and you feed him for a day. Teach a man to fish, and you feed him for a lifetime" :}
Thank You Sir.
great video, I've actually been wondering about this recently. this really helped clear some things up.
Good info Rex thanks!
love the new logo, by the way
Great vid, Rex! I like the format!
So excited for a podcast!
Cool video. Love watching what you do! Do what you love.
Very informative video. Thank you!
Thanks you did exactly what I was looking for
My neighbor gave me a bunch of rounds that were connected(belted) together. I just discovered what they are!!!! 7.62 x 54r!!!!! Just from watching this video. Thanks, man. lol
Excellent Rex!!!!
Hi Rex. Regarding your upcoming podcast, I took your recommendation on the IOR Valdada Recon & I love it! Worth every penny!! Thanks again for sharing & teaching us the ELR game. My first source choice is you; second is Litz. 😉
lookin forward to the rex optics wisdom!!!
Nice video . I have a new 82A1 and only have shot it about 10 times and I have been letting it cool about 10 minutes after each round . And we're it's new I been babying it.
For the cash you have in that I would baby it as well. I do the same thing with my 338 Lapua.
excellent channel ! deserves more subscribers
Just wanted to mention for those that don't nerd out on this stuff, the older cartridges such as 30-06, 30-40 Krag, 54R, 45-70, were designed when the available powders had a much slower burn rate, so they had to put more powder in the cases, so the cases were bigger than what you would need to use today for the same performance. The 308, for example, was based on the 30-06, but 50 or 60 years later the powders had gotten better, so it could be a half inch shorter with slightly better performance. Shorter case meant shorter rifle meant lighter gun meant a soldier can carry more ammo.
Awesome info, thanks for doing this one.
I didn't see the 22-250 on there. I'm guessing it's a barrel burner, by its crazy proportions. I bet even something like the .22 TCM is a pretty HOT shooter. Or the .357 SIG even.... This video made a lot of sense, bro. I enjoyed.
Always great! Thanks!
Thanks Rex,hey I know it's not your style but would you maybe think about reviewing the Franklin BFS or possibly the Fostech echo, I really appreciate everything you do and learn volumes from you. I have a lot of respect for you and enjoy your videos, also I apply what you teach me like your sniper 101 series.
Good stuff all the way from South Africa
keep it up rex
Nice Video! Thanks for the info. I can only imagine the throat erosion in something like a 7mm Allen Mag. There isn't a whole lot out there about it. Allen Precision sells 200 grain pills for it. Alco bullets makes a 208 grain .284 projectile with a claimed G1 B.C. of .945!! It's A .338 Lapua case necked down to a .284 and fire formed. They use the Lapua case for it's durability. You can push them out to about 3300 3350 fps with a 30" or 32" barrel with a 1: 8 or 1:7.5. According to my trusty ballistics calculator, a 208 grain bullet at 3300fps is supersonic beyond 2800 yards and retains 630 ft/lbs of energy!! That's a ballistic monster. Just for comparison a .408 Chey Tak with a 419 grain .940 B.C. at 2900 fps is supersonic to about 2400 yards and 1229 ft/lbs of energy. I'm kinda surprised that here in the us we haven't Experimented more with the 7mm as a sniper platform. It's certainly lighter at 15 lbs for the 7mm Allen mag than the heavier calibers, .338 Lapua, 408 Chey Tac, 416 barrett, and .50 cal BMG.
Ya I hunt with a 270 wsm, and even though I love the rifle. I remember sighting it in in 35C temps. After 2 shots, I had to let it sit for 5 to 10 minutes to cool it off. Ya, I know the 2 shot zero technique. But I was alone, and I was switching from using moa scope to a mil scope for the first time, and I'll use the excuse "heat stroke". But I dialed 1 mil for every inch I had to move the scope. lol Oh what a chit show that was. Went from starting off being 3" low 2" left to missing the target! Thought the scope was broke, etc. Until my brain came back on line and realized that 3 mils at 100 yards is actually just over 10 inches of travel instead of 3 inches!
Oh that was a miserable day at the range. Hot AF, and took me 2 hours to zero the rifle. And half that time was just waiting for it to cool. All's good though now, especially when that Tikka decided to shoot 150g fusions into cloverleafs from the bench. Cheap ammo and plenty good enough bullet for deer.
Rex, thanks for the video as always! That is a ton of rounds through your .243 WIN; would you say that your barrel is a rare exception? Also, I'd be in for some Tiborasaurusrex patches with the new logo on them!
good video
I own rifles in many of the calibers shown here, and one that's even more notorious for 'barrel burning,' the 257 Weatherby. I can only dream of having the time, money and location to worry about 'shooting out' any of my barrels.
I like the new preroll.
I got 1 1/2" groups at 200 yards with my 6.8 SPC II.
Great video as always.
Looking forward to your podcast.
Regarding your podcast, I'm happy to hear that you're not going to be holdng back. After all, people are tuning in for YOUR opinion. If they are "offended", they can make their own video or pod cast, presenting their opinion.
My .257 Weatherby barrel lasted 400 rounds. Its not a ground hog caliber, lesson learned. But a 90 grain Blitzking @ 3900fps made things disappear!
Love this style of video.
Very good presentation, I have a 270 cal BAR and was wondering about this caliber as far as throat erosion.
You could look into Soundcloud as a podcast hosting service. I think they are a little more friendly to independent content producers than iTunes is. I honestly don't know much about it, but it may be worth checking out.
Keep up the good work!
the rule of thumb is - any magnumization is not good for barrel life. Hence the 338 Norma Mag
may be awesome for ballistic performance but as a basis for a machinegun - so-so.
Don't forget, precision bolt guns are just bare cut steel bores. Most semi-automatics and machineguns have chrome lined barrels. Bare steel wears down way faster than chrome lined barrels, but bare steel is more accurate than chrome lined.
Sometimes I wonder if it's possible to chrome line just the throat and maybe the chamber but leave the rest of the bore as bare steel. Maybe that'll help these barrel burning cartridges last longer in precision bolt action rifles.
In theory, you could bore a barrel oversize, apply a thick hard chrome lining, then bore and cut rifle for a precision barrel that would last 3 or 4 times longer. But what would be the point when it would cost 10 times more? Cheaper to just rechamber or replace the barrel.
Very informative! Thanks!
Killer video!! Thanks!!
Cool video nicely done
great video. I learned a lot. I am a big fan of your SNIPER101 series. I was wondering what you views are on scout rifles and if you you could do a video on scout rifles and optics.
I have a 257 Weatherby and after 3-4 rounds I can fry an egg on it. While it is extremely flat shooting, I wish I would have gone with standard cartridge like the rest of my rifles.
.458 SOCOM for the win!
6.5 creedmoor AR is my next build. 😎 gosh I love the ballistics.
armstrong2052 I'm considering that caliber as well for a ruger precision or savage stealth BUT am hesitant because the Creedmoor has a rep for sorry barrel life. Other than that I am still wedded to the .308.
Thanks!
Are you filming this in the McDonald's bathroom?
lol
Yes.
The Taco Bell bathroom was full.
Well he did say "You have a relatively decent size outlet for your gas to escape" 5:18
bwah ha ha
Try to get your podcast on Stitcher Radio! I listen to many great firearm related podcasts on Stitcher. If I could listen to yours as well that would be awesome.
18:21 Whoa...I thought it was transitioning into a Metallica video. Nice lighting, bro...SEXY!!
300 weatherby, RUMs, 30-378 wtby, 7mm-300=barrels worst enemy. I have a buddy who picked up a 1960 something 300 wtby for 250 bucks, it put a bullet completely sideways through a board at 100 yards :D
Wow👍
243 win has a light bullet which would mean the bullet has faster acceleration from zero which in turn means pressure is released faster, i think
Rex, if the 300wby is over bore what do you think the ROM max precision round count would be if fired moderately with 168gr bullets with a fairly hot charge of powder? Thank you, Mark
nice vid, dude
Nice
you should talk about trijicon on the podcast since your gonna speak to the rest of them
Is there a reason why the .270 isn't discussed? One of the most popular cartridge in North America and I'd love to hear your opinion on the cartridge.
I've always loved the 22-BMG but have not found a suitible powder
Something slow burning like Kingsford Charcoal Briquettes...
fleischegurken rofl very nice
I've thought about this too, but on a serious note I've always wondered about a 50BMG case necked down to 40 cal or 45 cal might be interesting. I'm sure someone somewhere has tried this already.
Well .460 Steyr and .416 Barret are basically that except both also shortened the case a bit.
Would the .243 Winchester take the same bullets as 6.5mm? For 2017, I would like to build an AR-10/LR308 rifle. Obviously for logistics, I would do a 7.62 NATO upper. But I would also like to do 6.5mm. There is 6.5 Creedmoor. However, I would expect that .243 Win ammo would be more available and cheaper. If I can get a barrel, barrel extension, and bolt face in .243 Win for an AR-10 platform, then it seems I would be better off cost wise for ammo. For use it would be applied to NRA Silhouette. For precision shooting, it would go to 500 meters. That is the longest firing range I have access to. It would also be nice to share magazines with 7.62 NATO and 6.5mm. Extra nice would be not requiring a gun smith to do a custom barrel for me thanks to ITAR rules.
Hi Rex, What's your round count on your .338 lapua barrel ? .Looking forward to the PodCast
Not a whole lot, maybe 1,400rds is all. With that bad boy, a dozen rounds all properly sent, is a full day of satisfaction.
Rex.....I'm curious about the 7mm-300Win Mag . Does reshaping the 300 Win Mag casing to accept the 7mm projectileincrease the potential for throat wear when compared to the 7mm Mag?
Hey Rex, what time of day were you going to do the podcasts. I really would like to hear them and I don't get home from work until about 6:00pm Eastern time. Thanks!
They will be available anytime. There will be a library of podcasts (after they build up) that you can reference at your leisure.
What are your thoughts on the .260 Remington?
He loves it. Put it on his "desert island" list of 7 calibers.
9:17 shedding!!! \m/
what are your thoughts Trex on the 6.5 Grendel for a long range round, sustainable fire and a semi-auto platform?
Nothing regarding powder burn rate impacting throat erosion or did I miss that part?
Can you recommend me a book to learn about how the firearms works different parts types of barrel etc
1100 rounds 338 lapua , Rex inspired rifle😃, when should I change my barrel . 5 shots 15 min break for 1100 rounds so far , whats your recommendation when should I change my barrel?
I was kinda wondering about this today blasting out 168gr Amaxs out of my 300 Win Sendero to fire form new brass to neck size it. I've heard that 1200 or so rounds can get your accuracy below the roughly 0.7MOA I'm getting now.
Which Assult Rifle's barrel life span longer than the other?
Not that I shoot enough for this to be a problem, but what are the negative effects of throat erosion?