bulletsmith
Master
Conversation started in another thread: https://www.indianagunowners.com/fo...ng-headspace-checked-my-ar-3.html#post6263191
-.004 always.
View attachment 43802
Building LR Palma loads for my M1903 with its new Lyman Peep Sight.
https://www.indianagunowners.com/forums/gunsmithing/394012-whats-best-method-surface-rust.html
You guys keep conflicting what I have been reading. If you are full sizing each time, do you ever anneal your casings?
When you have the time, watch this guy. I'd be interested to hear what you guys think about his explanation.
[video=youtube;IKIJJ7chbRE]https://www.youtube.com/watch?v=IKIJJ7chbRE[/video]
When you have the time, watch this guy. I'd be interested to hear what you guys think about his explanation.
That would be a heck of a lot less work. I've been going down the route of FL size, trim the first time, fire, neck size, and monitor length. Though the throat on this rifle is so long that I think length may never be an issue. This is .308 btw.
You guys keep contradicting what I have been reading. If you are full sizing each time, do you ever anneal your casings?
I only trim, when needed, but I don't shoot comp., and I load LIGHT .....
My brass lasts a lot longer .....
Never annealed a case in my life. I FL size everything that gets shot in a semi-auto.
I gave your invitation due diligence and watched the entire video.
- He doesn't get to the topic until 11:00
- He has the theories of interior ballistics mostly correct
- He is interjecting his opinions about what determines case life. I personally have never heard of the concept of case expansion (or stretch as he refers to it) as being cumulative. He seems to state that cases can stretch a maximum of .012 and that is reached by adding together total stretch encountered at each firing. I call shenanigans on that point. I'm not a metallurgist. I think of this topic like a piece of clay: I can stretch it numerous times, how many times is determined by how rough I treat it and how hot I heat it. Hot loads = higher temps. Sizing too far = rough treatment. I know shooters that get well more that 4 reloads out of their brass, I'll call it 7 time before they pitch it just to be on the safe side. I toss mine at 6. In the 15 + years I've reloaded, I've never one time had to remove a failed case from any of my rifles (or pistols).
- He doesn't factor in the extractor claw pulls the base of the cartridge into the bolt face. Some of the growth occurs at the datum point of the bottle neck.
- He doesn't factor in the elasticity of the metal. sloughfoot referred to it in the other thread as springback.
- The accent was painful.
He makes a good comment about "Those people aren't wrong, but they're not exactly right". I think he inadvertently described himself as well.
I've unfortunately annealed piles of brass, enough to demonstrate to myself it isn't useful. I have a Ken Light annealer laying around somewhere.
And I FL about everything and load full house charges even when fireforming, so I'm not babying the stuff.
Best case life, in bolt-action rifles, is obtained by neck-sizing when setting the shoulder back is not indicated, and by setting the shoulder back by as little as possible, when indicated.
Sometimes FL resizing results in a case that is not worked excessively, either because of a tight chamber or a die that is adjusted properly to the chamber in question. Case life is increased, either way.
You're making more out of this than need be. If you're really that concerned about it, there are two schools of thought: Get the tools to KNOW your chamber dimensions, and size accordingly, or use the tools you have on-hand to size your cases just enough for them to be fired again. Neither is complicated and it's more of a personal choice how you go about it. I was taught the old-school way, so that's what I use, and it's still just as effective as ever. If you've got the money to spend on the extra equipment, and really want to know your chambers well, go that route.
Best case life, in bolt-action rifles, is obtained by neck-sizing when setting the shoulder back is not indicated, and by setting the shoulder back by as little as possible, when indicated.
Sometimes FL resizing results in a case that is not worked excessively, either because of a tight chamber or a die that is adjusted properly to the chamber in question. Case life is increased, either way.
You're making more out of this than need be. If you're really that concerned about it, there are two schools of thought: Get the tools to KNOW your chamber dimensions, and size accordingly, or use the tools you have on-hand to size your cases just enough for them to be fired again. Neither is complicated and it's more of a personal choice how you go about it. I was taught the old-school way, so that's what I use, and it's still just as effective as ever. If you've got the money to spend on the extra equipment, and really want to know your chambers well, go that route.