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<blockquote data-quote="Bob Wright" data-source="post: 1571921" data-attributes="member: 104363"><p>Don't give up! Unless you want to throw your gun my way, instead of down range lol!</p><p>You're drilling down. Take a breather.</p><p>Question everything again.</p><p>The beauty of the AI conversions was they fired the parent cartridge to fire form to the AI version. My money is on headspace, as it sometimes fails to fire, you mentioned "bolt feel" being weird, you're getting a primer strike but no ignition, you are just "that much" off. Let us know what you find. Interesting....</p><p>If you have everything correct in your dies and chamber, headspaced w/go no go gages, anneal your troubled misfiring brass. Take careful headspace measurements and record it to each cartridge before and after firing and see if they fireformed differently ( I have the Hornady gages). Compare to rounds that fired fine before you had misfires on others.</p><p>My freshly annealed 7mm mag brass surprisingly grew by .001 to .004 on brass that had multiple firings on them, and were Nosler brass. Now, they are all within .001 with one firing after annealing. I had no misfires either way, but I now have a good baseline knowing my datum line is good on the shoulder on all brass and they chamber smoothly. On the belted mags, the headspace is pure slop at the shoulder and shockingly they can grow .020 or more, since they are headspaced off the belt when new. Mine are .018 off the shoulder with new SAAMI brass....wow. That's why annealing corrected the headspace by the final few thousandths. They were work hardened after that first firing. The 280 AI is moving that shoulder by .091 fire forming the parent cartridge. Way more than my 7mm mag.</p></blockquote><p></p>
[QUOTE="Bob Wright, post: 1571921, member: 104363"] Don't give up! Unless you want to throw your gun my way, instead of down range lol! You're drilling down. Take a breather. Question everything again. The beauty of the AI conversions was they fired the parent cartridge to fire form to the AI version. My money is on headspace, as it sometimes fails to fire, you mentioned "bolt feel" being weird, you're getting a primer strike but no ignition, you are just "that much" off. Let us know what you find. Interesting.... If you have everything correct in your dies and chamber, headspaced w/go no go gages, anneal your troubled misfiring brass. Take careful headspace measurements and record it to each cartridge before and after firing and see if they fireformed differently ( I have the Hornady gages). Compare to rounds that fired fine before you had misfires on others. My freshly annealed 7mm mag brass surprisingly grew by .001 to .004 on brass that had multiple firings on them, and were Nosler brass. Now, they are all within .001 with one firing after annealing. I had no misfires either way, but I now have a good baseline knowing my datum line is good on the shoulder on all brass and they chamber smoothly. On the belted mags, the headspace is pure slop at the shoulder and shockingly they can grow .020 or more, since they are headspaced off the belt when new. Mine are .018 off the shoulder with new SAAMI brass....wow. That's why annealing corrected the headspace by the final few thousandths. They were work hardened after that first firing. The 280 AI is moving that shoulder by .091 fire forming the parent cartridge. Way more than my 7mm mag. [/QUOTE]
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