To crimp, or not to crimp

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Muley

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I'm trying to find a ringer load for my RRA predator, I'm wondering how important y'all think it is to crimp a round for an AR considering it's an auto loader. I don't crimp any of my other rifle loads, but they're all bolt guns.
 
I never crimp rifle rounds, and if its a Predator Pursuit, mine liked 60gr Sierra Varminters over H335:)
 
I won't say that you NEED to crimp for the AR. With proper neck tension, the bullet isn't going anywhere. I do crimp because I get more consistent groups using a Lee Factory Crimp Die. So far, I only use it for .223. I saw no benefit with .308.
 
I have tried crimping and not crimping my .223 rounds. I do not see any measurable difference in my guns. I do know that crimping works the end of the neck more than not using a crimp will and might cause neck splits to appear faster YMMV. From what I have observed if the rifle is set up for 5.56 nato the 62-63 grain projectiles are more accurate due to the twist rate normally used.
 
I have done accuracy tests using a Colt AR, and a CZ-527, both crimped with an FCD, and uncrimped.

If there is any differance at all in accuracy in my two rifles, it is so slight I can't measure it.

Proper neck tension & good feeding magazines is the key to preventing bullet set-back in an AR-15.

Your expander plug needs to be about .222" to no more then .2225" for proper neck tension.

If it is larger then that, chuck it up in a drill and turn it down with black emery paper.

rc
 
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