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Old April 16, 2012, 11:38 AM   #6
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Join Date: February 7, 2009
Location: Southern Oregon!
Posts: 2,306
The term "crimping" should not be used when talking about 45 ACP reloading; it just causes confusion for new reloaders. A taper crimp die is used to straighten out the flare applied to the case mouth to facilitate bullet seating, and neck tension should keep the bullet in place. "Case mouth reshaping die" is a better term "Reshape" the case mouth (crimp) enough to straighten out the flare to enable free chambering, but not too much that the case won't headspace on the case mouth. Hey, jes an old guy's opinion, but it works for me...

P.S.; a lot of guys measure the "crimped" case mouth and suggest .470" as a targer measurement.
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