Posted: 05 Apr 2013, 20:05
All I have are large pistol primers, and I'm pretty new to reloading, so I've been reloading alot of .45 Colt. I shoot them through a .454 though, so in case I make a rookie mistake, I have about 40,000 PSI of wiggle room. I generally load to max or +P pressures, and with all sorts of 230-250 gr boolits, I've had nothing but success, until last weekend. It's my understanding that any safe load for a 250gr jacketed boolit will also be safe for a 185gr jacketed boolit, so I loaded up 17.5gr of 2400 behind a 185gr .4515 HP. I have no roll crimp die yet, so I used a 1/4 turn with my taper crimp die, and watched for boolits coming out of the cases. I didn't see any evidence of that, but I did have some moderately flattened primers on about 1/2 of my loads. My theory after thinking it over at work is that the light, slightly undersized boolit combined with the non-ideal crimp allowed the primer to push the bullet forward slightly before the 2400 burned right (it's a magnum pistol, slow burning powder) and created a secondary pressure spike that mooshed up my primers a bit. Recoil and noise varied quite a bit shot to shot, like shooting .22LR on a very cold day. Recoil was never stout, even by .45 Colt standards (4.5# gun as well) but I could definately feel a difference. Does my theory make sense, or did I just make it up in my head?