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Shoots High Posted - Jan 06 2017 : 18:16:54
I have been trying to adjust a .45 acp roll crimp die. I am loading for a 1911. I need to get it to close up about .002 more to get a good fit in my chamber, but all I can seem to do is crush a case. After about 50 rnds. I am going to give up and buy a taper crimp die. I got these carbide rcbs dies for a very good price, but it's not a bargain if I can't get them to work right. I have tried every trick I know of, even adjusting off of a loaded factory round, and spending 45 minutes with the rcbs guy on the phone (very helpful guy by the way).
I can make a roll crimp work for a M1 carbine, but for some reason not a .45 acp. What am I doing wrong?
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WonderMan4 Posted - Jan 07 2017 : 13:24:30
I noticed that you changed your post to be a little kinder. Good for you.

A roll crimp is almost always unsuccessful with the 45 ACP when shot in semi-autos.

What happens is the firing pin will drive the cartridge deeper into the chamber than it needs to be thus creating some fail to fire situations.

With a taper crimp, the rim of the case seats on the chamber edge and prevents this movement.

You asked why the RCBS Tech was so willing to assist you. I am not sure why. Almost anyone with some knowledge would know that you needed a taper crimp die.

Why do they sell them? Maybe for use in revolvers that use "moon" clips to hold the cartridge at the rim. I always wondered why they sell 44 Mag dies with a taper crimp die in the set, but they do.
Shoots High Posted - Jan 07 2017 : 10:26:25
Although not ideal they can be used successfully. I will take your advice though and get back to basics. Thanks
Shastaboat Posted - Jan 06 2017 : 20:52:44
45 acp is a taper crimp case design. NO ROLL CRIMP. .30 Cal carbine is also not a roll crimp design case. Go back to basics and learn the difference in a roll crimp, rimmed pistol case and a taper crimp rimless design case.

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