Then there is the question of how much crimp with a taper crimp die, for my 1911 that is set up for bulleye shooting with a Kart barrel and using lead bullets the crimp I use measures around .465 which is pretty tight compared to to Federal 185 grain FMJ swc's which measured about .469 if I recall correctly. I would not try to crimp jacketed bullets as much as the lead ones. Of course it is best to test your loads in the gun you want to shoot them in and in most cases (bad pun intended) stick to as close to factory specs as possible especially for a starting point.