The crimps from the Lee Factory Crimp die on my 44 caliber loads look like your "heavy" crimp. They shoot fine and I noticed a slight improvement in velocity consistancy. It does seem to wear the brass slightly though. Back off your load and work up to your current load using the heavy crimp, and see how it shoots. It probably will hold the bullet longer before releasing it, this could cause higher pressure but in my case it seems to improve powder burn consistancy. Whatever crimp shoots best use that crimp.
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Don N.
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