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Old December 4, 2009, 07:19 AM   #9
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Join Date: February 2, 2008
Posts: 3,150
Crimp on the .45 ACP round (or any round that headspaces on the case mouth) is not really a critical factor. I would concentrate more attention on ensuring that the case mouth has sufficient tensionon the bullet. Seat a bullet and try to push it back into the case (before crimping). You should not be able to move it no matter how hard you push. Once you get to this point the crimp is used only to remove the flare from expanding. Trimming ACP cases is kind of a waste because in time they just going to get shorter and most of the new cases I have measured are short to begin with. A heavy crimp is not going to stop setback and can actually make it worse.
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