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Rifles, Reloading, Optics, Equipment
Reloading
Virgin brass, or once fired!
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<blockquote data-quote="Mikecr" data-source="post: 1907346" data-attributes="member: 1521"><p>Yeah the headspace potential with new brass doesn't affect best tested CBTO with my guns. This testing having occurred during fire-forming.</p><p>That is, it hasn't mattered so far when I find best CBTO. Whether cases are new, 2nd, or 3rd, or 30th fired. 1500 shots later, best CBTO is right where earliest testing proved it -for me.</p><p></p><p>Perhaps helpful though: the largest cartridge I shoot is 26wssm, none of my chambers are sloppy, my primers are measured as seated with 2thou of crush, and my chambers are kept clean and free of oil (practically dry).</p><p>I could picture a point where things are worse. But things can only be just so worse before primers fail to fire.</p><p>After all, it doesn't take much for primers seated off pocket bottoms before FTFs occur.</p><p></p><p>IMO it wasn't changing seating, or not changing, or anything about seating, that produced the very low ES pictured earlier with new brass[#24 338Edge]. I believe it was new brass expansion capping the pressure peaks to a consistent point, like a heavily diminished return. A very forgiving, but fleeting condition.</p><p>It would great if we could re-establish the condition over & over with same cases, but we can't. Well, I don't think we can. I am sure that firing new cases forever changes them, beyond actual recovery.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1907346, member: 1521"] Yeah the headspace potential with new brass doesn't affect best tested CBTO with my guns. This testing having occurred during fire-forming. That is, it hasn't mattered so far when I find best CBTO. Whether cases are new, 2nd, or 3rd, or 30th fired. 1500 shots later, best CBTO is right where earliest testing proved it -for me. Perhaps helpful though: the largest cartridge I shoot is 26wssm, none of my chambers are sloppy, my primers are measured as seated with 2thou of crush, and my chambers are kept clean and free of oil (practically dry). I could picture a point where things are worse. But things can only be just so worse before primers fail to fire. After all, it doesn't take much for primers seated off pocket bottoms before FTFs occur. IMO it wasn't changing seating, or not changing, or anything about seating, that produced the very low ES pictured earlier with new brass[#24 338Edge]. I believe it was new brass expansion capping the pressure peaks to a consistent point, like a heavily diminished return. A very forgiving, but fleeting condition. It would great if we could re-establish the condition over & over with same cases, but we can't. Well, I don't think we can. I am sure that firing new cases forever changes them, beyond actual recovery. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Virgin brass, or once fired!
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