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Old March 30, 2011, 04:04 PM   #1
Sea Buck
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.45 Auto Rim: Roll Crimp or Taper Crimp ?

I want to load up some .45 auto rim cases. Is it ok to use a taper crimp on the FMJ bullets as long as I keep the velocity down to the 700-750 fps range.I use a pretty stiff taper crimp on my ACP loads and might back off on that a little.The loads are for informal target shooting at 25 ft.
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Old March 30, 2011, 04:12 PM   #2
moxie
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Crimp them the same as your ACP loads. And actually, even on those, you only need a light taper crimp. The only time you'll need a roll crimp is when you are using heavier bullets and loads, and the bullet has a definite cannelure into which you can roll the case mouth.
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Old March 30, 2011, 04:13 PM   #3
overkill0084
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If it were me, I'd probably just stick with taper crimp. Especially since your using mild loads. If it ain't broken, don't fix it.
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Old March 31, 2011, 12:28 PM   #4
William T. Watts
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Taper crimp only enough that the round slids fully into the chamber without assisting with your fingers, My loaded rounds mik .470"--.471" across the case mouth for my Springfield. William

Last edited by William T. Watts; April 3, 2011 at 06:39 PM.
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Old April 3, 2011, 04:32 AM   #5
Clark
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How are you going to roll crimp?

Cut off the bottom of a 45 Colt seater die?

I am tempted. I can't shoot full house loads with long length in Lead, or the recoil pulls the bullets out.
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Old April 3, 2011, 11:25 AM   #6
Ozzieman
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Taper crimping requires a 4th die since its difficult to taper crimp as you seat.
Most ACP dies come as 3 die sets and can be a factory or roll crimp.
Once you start taper crimping you will never use anything else. Personally I prefer a firm taper crimp as long as it doesn’t deform the case. Due to the different case manufactures and wall thickness the firm crimp gives me a more uniform velocity and accuracy.
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Old April 3, 2011, 05:20 PM   #7
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If the revolver is a S&W, I can't see how it would matter much.

A '17 Colt has the 'step' in the cylinder that allowed the GI to shoot GI ammo w/o the half moon clip. Headspace was on the rim, not the half moon clip. Extraction via fingernail, but it did pop the primer.

I had one back in the 70s or so. Thats the way I remember it.

Some curious souls have used cut down '06 brass and rolled their on shot cartridges. That was pre-Speer shot cups.

salty

Last edited by saltydog452; April 3, 2011 at 05:29 PM.
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