45acp roll crimp?


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Bisbee
October 10, 2012, 03:01 PM
I purchased a used RCBS die set for 45acp. After casting a few 200g. SWC bullets I started to load the cases when I discovered my seating die was a roll crimp die. Would someone tell me why I would roll crimp a 45acp. Thank you.

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joustin
October 10, 2012, 03:12 PM
Maybe for a revolver. Back off on the crimp so that it is just enough to remove the flair. Other than some of my oddball 230grain lead bullets I never really see a crimp.

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Spammy_H
October 10, 2012, 04:06 PM
I believe that you would roll crimp for .45 Auto Rim. Not that I've ever seen anything chambered in .45 Auto Rim, it's just that my Lee die set says ".45 ACP / Auto Rim", so I guess that there's something chambered in .45 Auto that expects the brass to have a rim on it.

cfullgraf
October 10, 2012, 05:10 PM
My circa 1980 RCBS 45 ACP dies have a roll crimp in the seater die. Roll crimp rings were more common in auto pistol dies in those days.

The die can be set to remove the flare by just engaging the crimp ring. The adjustment is a bit more touchy though.

rcmodel
October 10, 2012, 05:21 PM
The .45 Auto Rim was created by Peters cartridge company in 1920 for use in military surplus Model 1917 S&W & Colt revolvers chambered in .45 ACP.

They allow single loading and ejection without the need for half-moon or moon clips.

Revolvers are still made today chambered for .45 ACP.

Note the .45 Auto Rim cartridges in the lower right of the photo.

http://i81.photobucket.com/albums/j219/rcmodel/KTOG/100_3888.jpg

rc

nofishbob
October 10, 2012, 05:46 PM
My Hornady 45 ACP three die set came with a roll crimp built into the seater/crimp die. This was touchy to set up properly especially when loading lead bullets. I added a Lee FCD to the mix for a while to remove the flair but it was not optimal.

I finally bought a Hornady taper crimp die and am kicking myself for not doing it thousands of rounds and lots of frustration ago!

I think that including a roll crimp die in a 45 die set is a pretty questionable choice given how few people actually want to roll crimp their 45 ACP/45 RIM ammunition

Bob

Bisbee
October 10, 2012, 06:11 PM
Thanks all for your information. As Bob suggested, I think a taper crimp die will be coming my way soon!

Drail
October 10, 2012, 07:34 PM
Just back the die off until it just removes the flare. .45 ACP doesn't really need any crimp unless you have a tight match chamber.

hentown
October 10, 2012, 07:44 PM
Removing the flair is all any taper crimp die is supposed to do. I use a Lee die setup, seating and crimping separately. I use the FCD for the final station. I don't care that the post-sizing never engages with my reloads; I just like the way the crimp is adjusted with the FCD.

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