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Message: <blockquote data-quote="Blitzfike" data-source="post: 2717951" data-attributes="member: 807"><p>Taper crimp is great for semi autos, the biggest cause of fail to feed in semi auto pistols with reloads in my opinion is leaving too much expansion of the case mouth after seating and crimping. Most all of the so called straight walled semi auto pistol cases are slightly tapered to facilitate chambering. if you leave the case mouth larger than the remainder of the case you can expect trouble with your loads. The taper crimp die if adjusted properly both provides the needed crimp and also eliminates that expanded case mouth. The Lee FCD just does it easier in my experience.  Unlike bottle neck cases, you really have to mal-adjust a crimp die to bulge a non bottle neck pistol case.</p></blockquote><p></p>