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  #1  
Old 01-07-2012, 04:44 PM
LWILLIAMS LWILLIAMS is offline
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Crimping 45 acp




Hi all,

just came back from the range. I was talking to an older competion target shooter.

We were discussing reloading 45 acp for 1911
i thought he was going to have a stroke when i told him i have never crimped this load.
I only shoot light target loads. I guess my question is, is it really necessary to crimp??? I am loading 200 gr lswc pushed by 4.2 gr of red dot or bullseye.
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  #2  
Old 01-07-2012, 04:51 PM
Orochimaru Orochimaru is offline
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45 ACP headspaces on the case mouth. You want to crimp enough to remove the flare and not really any more -- what is commonly called a taper crimp. I usually use calipers to measure the case mouth and make sure that my case mouth is 0.469-0.471 after the bullet is seated and the flare is removed (taper crimp applied).

You do NOT want a roll crimp like you might see with a magnum revolver load, etc.
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  #3  
Old 01-07-2012, 05:09 PM
french toast french toast is offline
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search this forum, you'll find a lot of us use a Lee Factory Crimp Die, you

will also find some that will hold their nose even mentioning this. but

i had a problem where my 45acp rounds would not fit in the case guage,

after using this die problem solved.... also those round would not feed,

doesn't happen anymore. i try not to make reloading too complicated

but develop safe and reliable ammo.
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Old 01-07-2012, 05:18 PM
LWILLIAMS LWILLIAMS is offline
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Crimping 45acp

Me again,

i have a lee crimp die that came with the set.
I will try it and see if anything changes......accuracy i hope . !!!:d
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  #5  
Old 01-07-2012, 05:22 PM
Alland Alland is offline
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For a 45 a crimp certainly is not needed if they feed and chamber without jams. I do taper crimp with a Dillon die to about .470.
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  #6  
Old 01-07-2012, 06:13 PM
BYJO4 BYJO4 is offline
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I also recommend the use a slight taper crimp as noted above.
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  #7  
Old 01-07-2012, 06:53 PM
cburlette cburlette is offline
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If you don't crimp, or do a very light crimp you must be careful of bullet setback. Setback is where the recoil of a fired round makes the bullet's in the magazine shorter. It's the same issue with automatic weapons and crimped primers, the kinetic energy created in firing a round makes an uncrimped primer back out of the round.

Take a full magazine of rounds of known and recorded OAL, fire off 2 then check the OAL of the next round. Fire off a few more and check OAL again until you get to the last one in the magazine. Measure that one and if it's OAL is shorter than you would ever reload to, taking into consideration the powder charge in the round, then you have a problem with setback.

Craig
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Old 01-07-2012, 09:18 PM
johnnymoses johnnymoses is offline
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I've been loading pretty much the same load,200gr SWC & Unique, with the same Lee die set for over 20 years. After I picked up a RCBS taper crimp die at a gun show ($10) I don't think I've had a failure to feed since. I'm not sure I understand, it looks like a roll crimp would feed better, not worse. Maybe cause there's no crimp grove? Anyway there it is.
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  #9  
Old 01-07-2012, 09:36 PM
johngfoster johngfoster is offline
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Quote:
Originally Posted by johnnymoses View Post
I've been loading pretty much the same load,200gr SWC & Unique, with the same Lee die set for over 20 years. After I picked up a RCBS taper crimp die at a gun show ($10) I don't think I've had a failure to feed since. I'm not sure I understand, it looks like a roll crimp would feed better, not worse. Maybe cause there's no crimp grove? Anyway there it is.
A roll crimp may FEED better, but then you would run into headspace problems as there would be no defined case mouth to headspace off.
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  #10  
Old 01-07-2012, 10:23 PM
old cop old cop is offline
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I thought the extractor played a part in headspace
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Old 01-07-2012, 10:35 PM
84BravoJ8 84BravoJ8 is offline
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Quote:
Originally Posted by old cop View Post
I thought the extractor played a part in headspace
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  #12  
Old 01-07-2012, 10:41 PM
invssgt invssgt is offline
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Quote:
Originally Posted by johnnymoses View Post
I've been loading pretty much the same load,200gr SWC & Unique, with the same Lee die set for over 20 years. After I picked up a RCBS taper crimp die at a gun show ($10) I don't think I've had a failure to feed since....
Big amen to all that. Only diff is that I'm using Hornady's version, but the taper crimp cured my .45 ACP reloading woes.

I use range pick-ups and I run a pretty snug crimp.
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  #13  
Old 01-07-2012, 11:47 PM
Alland Alland is offline
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Quote:
Originally Posted by old cop View Post
I thought the extractor played a part in headspace
Not unless the brass is too short or chamber too deep. But that is many times the case with reloads since the brass can shorten with use.
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