I reassemble the pistol (er firearm) and then chamber the round slowly and let it go fully into battery. If it won't seat fully in the plonk test then I grab a case that I split using a dremel and seat the bullet out at 1.169. If it seats properly then I note that 1.169 is the max for this bullet/firearm combination. I set it at 1.169 and see if it will drop into the chamber of the barrel (removed from the slide, barrel only). What I do when I acquire a new bullet is do a chamber test. Changing the OAL is akin to changing the powder drop, in terms of sending pressures above max levels, if you are not careful things go poorly for you. The specified OAL for the specific bullet and powder combination results in specific pressure and FPS combination.
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