Re: .338 lapua brass
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: High Binder</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 71firebird400</div><div class="ubbcode-body">I would not buy once-fired brass, ever, for anything. Brass has memory, the molecular structure of it is permanently modified each time it's fired. Resizing it does not put the molecules back the way they were, if it did you wouldn't see the case length grow with each sizing. </div></div>
It may just be the Tribologist in me but this may be one of the single <span style="text-decoration: underline">stupidest</span> posts I've seen in quite a while. Now in laymen terms: The "molecular structure" refers to the composition of the brass and no matter how many times you fire it it's still going to be brass (B7 specifically). You could melt it, burn it, and even take a hammer to it and it's still going to have the exact same "molecular structure" it had when it came brand new from the factory.
Now, I know you don't know but what you were trying to refer to was its crystalline structure. Which will change a little with every shot and re-size and over X-number of cycles the brass (in this case) flows and "work hardens" (strain hardening) and becomes more brittle which in turn leads to cracks and failures. So in the most laymen of terms: The process of annealing corrects that "work hardening" returning the brass to a state where it is more 'flexible' i.e. mailable. Now annealing isn't a cure, it's only a band-aide so eventually you'll have to replace all of your brass. All of that being said, once fired brass is just fine. If what Firebird said was true, what point would there be to reloading anything.... </div></div>
Then explain to me why people experience issues with brass that has been fired in other guns. If what you're saying is true, then we'd be able to take any piece of brass, run it through a FL die, and it would be exactly as that brass was from the factory. In my experience, that simply isn't true. Brass has a memory, brass has casehead expansion; these are things that a resizing die cannot put back to normal. I had a run of 338 brass that would continue to show pressure signs (difficult extraction), even on the beginning charges. After sending the brass and dies back to Redding (and again to Forster) the explanation I was given by Redding was that if you have a loose chamber the brass is permanently "stretched" and will retain that memory for all consecutive firings.
I'm not looking to start an argument here, but I posted my above scenario back when it happened and I got a bunch of blank stares. Redding provided me what I thought was an accurate response, but if that isn't so then please educate me.