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Old August 20, 2012, 11:07 AM   #5
SL1
Senior Member
 
Join Date: November 8, 2007
Posts: 2,001
While it is true that taper crimp is the standard and proper type of crimp for use of .45 ACP cartridges in auto-loading pistols, there ARE roll crimp dies out there.

Apparently, they are mainly intended for loading .45 ACP cartridges that are to be shot in revolvers using "moon clips" or "half-moon clips" (to allow ejection in double action type revolvers), or the .45 Auto Rim (AR) cartridge (which is intended to be shot without requiring the use of those clips in revolvers that were designed for .45 ACP cartridges with clips).

In revolvers, especially rather light ones, the recoil tends to make the bullets pull out of the cases, and that can tie-up the cylinder so that it can't rotate. A roll crimp is what is used to prevent that from happening in most revolver cartridges.

So, with the dual use of the .45 ACP and the existence of its cousin, the .45 AR, there ARE roll crimp dies made for .45 ACP. RCBS makes them, for example, but usually includes taper crimp dies in their die sets marketed as ".45 ACP dies."

So, it is best to CHECK rather than ASSUME when evaluating some dies that are new to you.

SL1

Last edited by SL1; August 20, 2012 at 11:35 AM.
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