Case Sizing In Depth
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- เผยแพร่เมื่อ 17 ต.ค. 2024
- Though Randy has covered case sizing, in this video he goes more in depth for our Patreon supporters. First published in August of 2020 it is now made available to our TH-cam and Rumble followers.
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Thanks for another great video Randy. I thought of this trick years ago. I take a case with a split neck or make one and neck size it and then use that case in my rifle to seat a bullet from various manufacturers. Then I gently remove it and take measurements. I then set the bullets slightly deeper with my seating die to give as much jump to the rifling I want. With the newer very long bullets, most need to be longer than magazine length or have a very long jump to the rifling.
Thank You Mr. Selby for another helpful video
Thanks for sharing!
Reloading 101 but the way he explains it is fantastic.
great content ! I have been reloading for over 69 years, was reloading my dad's 257 ai at the age of eight years old under my father guidance and still learning new things today! recently started using closing cartage under the feel of the bolt for case resizing with great success. keep the information coming. have a few custom rifles, but most a just factory rifles that shoot excellent with hand loads tweaks. thanks for the great review of what your other lectures
Learning to use the comparator gauges has been a game changer for me.
As has setting my sizing dies as you described earlier.
Thank you !
Listen up! Much to be learned here from the master.
Randy always has great instruction and advice!!
Great info as always. I have the Hornady comparator set. I’ve since upgraded to the Redding Instant Indicator and it’s awesome.
Randy great advice we cannot all assume the bigginer knows these things. I instruct all bigginers to watch your video's there always the best an safest ways to themselves an there rifles. Another well thought out video for our use. Very grateful for your time an so much knowledge thats been a gift to you an to us from God's grace a real ministry in its way.
I'm still adding to my library of videos that you produce for future reference when I need to reconsider a specific question about precision handloaded ammunition. It's a real help for my quest to produce the best that there is! Thank you sir, and God bless.
Another excellent video. Thanks and God bless. Duane
Hello Mr. Selby,
I rebarreled my Ruger Tang Safety M77 from its native 308 Win to 260 AI from PacNor barrels in Brookings, OR. In the decision, I read up on the various riflings and chose polygonal due to its ability to more evenly distribute friction down the barrel and potential accuracy benefits. After a couple hundred rounds, I can say, at least in this application I have no complaints. So I wonder why it hasn’t gained the popularity it may deserve. Do you have an opinion on polygonal rifling, if so, what is it?
Great advice from the best.👍
@therealgunsmith you seem to do a lot of work on .300 weatherbys. in my experience these have a huge freebore. trying to chase lands is a futile experiment. in any .300 weatherby chamber i find that by the time you touch lands even with a long bullet like A 200-220 GR. ELD MATCH it is barely in the case. do you have theories on the reason for this amount of freebore? i have read thats how roy acheived the high velocities others say its to accommodate a wide variety of loadings
The voice of experience is the voice of knowledge
Lots of good advice here Randy, thanks. When reloading for a ruger no 1 can these methods be followed or are there other methods for the no 1?
Same for #1's.
Thanks for watching.
I have seen bullet profile, secant vs ogive make a big difference in how the bullet responds to jump distance. I have read and heard that this is mostly due to axial bore alignment between the chamber and the barrel. Basically the idea that if everything is lined up properly the amount of jump will matter, but mostly how the load and rifle is handling pressure variables. Others run nearly no jump at all because they are getting tighter groups with that particular load. They give up some performance however due to hitting max pressure sooner. Randy do you have any thoughts on this? Is this an alignment issue in your opinion if a rifle /load doesn't accept jump without the groups going to pot. Would like to see what your preference is on the whole jump to the lands topic. Thanks
My favorite load is the one that shoots the best in said gun.
Well I'm sorry to say that the over bore plays a major role ,by paying close attention to the barrel dimensions as ten thousands of an inch makes a hell of a difference but then again there are a lot of different types of rifles and how they were meant to operate some are built to fire in rapid fire while the barrel dimensions are bigger like the 7.62×39 inwhich varies between .308 and .312 while other rifles like the 303 British were actually meant for some accuracy as said by Joyce Hornady and the tolerances of a Rolls Royce !
On a slightly different subject, what is your opinion or experience with a 30 caliber 180 grain sst bullet?
They are bombs and turn into shrapnel.
Thanks for watching.
Bombs, I like hard hitting. I wasn't so sure how well they held together when they hit the target. I'm working up a load for a 300 win mag moving at 3100 fps,
4 to 500 yards max
Sorry, I read your response wrong.
Bombs that turn into shrapnel is not good. I'll keep testing other bullets, thanks.
I don't reload without a headspace and bullet comparator. They are a must for the average person to reload consistently and safely. In other words providing you have an understanding of what your doing you won't be pushing your shoulders back 20 or 30 thousands and then seat your bullet to overall length creating a high pressure situation.
👍🏻👍🏻
I have spoken.
So is there a resource that tells us what the datum line diameter is for each cartridge?
Sammy does. Some manuals show it some don't
Question, datum line can change. New brass, fired brass, resized brass. Which tool being used to measure. Talking
practical hand loading
Use the comparator set, but be sure to use the same comparator each time. Use one of the sizes that hits on the datum. Measure the fire formed brass from your rifle then bump the shoulder and measure with the same tool. You will be able to measure the difference and that is your shoulder bump or setback.
@@leeNWHuntinganFish4713 thanks Lee. I'll check the sammi specs. I use the measurement, but just by selecting a size that touches the shoulder, not any specific diameter, and then just record what I used on my load data card. I've often wondered if there is a specific size for each cartridge. None of my manuals show it.
Chamber prints from SAMMI or reamer makers have the information.
Thanks for watching.