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crimping dies what do you use

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Old 08-17-2011, 05:56 PM
Junior Member
Join Date: Jul 2011
Posts: 5
crimping dies what do you use

I am having issues with over all length growing after dropping the charging handle then removing the round.I am using a Lee factory crimp die.this is my first ar-15 and I have no semi loading exp.I do have alot bolt gun loading exp though.I feel like I am crimping them too much and they are still growing.my buddy says get a tapperd crimp die.what do you guys think and use.
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Old 08-18-2011, 06:41 PM
Junior Member
Join Date: Jul 2011
Posts: 5
Re: crimping dies what do you use

I ordered a redding tappered crimp die it should be here tomarrow or monday. I will try it and post back my results.
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Old 08-21-2011, 07:13 PM
Junior Member
Join Date: Jul 2011
Posts: 5
Re: crimping dies what do you use

I got my redding tappered crimp die.I set it up and tried it.I don't think it works as well as the lee factory die.I just wasn't crimping enough I beleive.I re adjusted the die(pretty much squshing the snot out of them) and rechecked them after closing the action.they they still grow 2-3 thousands.I gess I can live with that.
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Old 08-23-2011, 08:59 AM
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Join Date: Feb 2009
Location: Sedalia, MO
Posts: 1,253
Re: crimping dies what do you use


Not a fan of any type of crimping in ARs, and I don't use them myself in my own loading. However, I've had to work with a variety of these professionally over the years, so have had some experience with them. Of the lot, the Lee Factory Crimp is far and away the best out there. One of the various taper crimps (Redding, RCBS, whoever) would be second place.

One of the keys to AR accuracy is using sufficient neck tension, and avoiding the crimp altogether. I like bushing dies for this very reason; it lets you set the degree of tension to a much greater degree than any other method that I'm aware of. I normally use an expander ball (preferably carbide) but select the bushing that leaves it with the faintest kiss as the ball passes back through the neck. If you run an expander ball that's .002" below bullet diameter (.222" max), that should give you a decent grip while not overworking the necks. Important to remember that when you trip the bolt, what you're dealing with here is the world's heaviest and most expensive kinetic bullet puller. The fact that your bullets are only pulling .002"-.003" tells me that you're pretty close to the max already. I've done testing using even M193 military ball ammo, complete with asphalt neck sealant AND crimp, and still seen this level of movement. It's just a fact of life with the ARs, but so long as you're not moving too much more than this, it's nothing to loose sleep over. You're doing fine here.
Kevin Thomas
Lapua USA
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Old 08-23-2011, 10:08 AM
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Join Date: Jan 2008
Posts: 940
Re: crimping dies what do you use

I use the Lee Factory Crimp Die and have had no problems with bullet movement. One little tip I can give you is leave your cases 5 thousands longer than the trim to length. This will give you enough case to get a good bite on to get a good crimp. If you trim them down to the trim to length you are not getting much if any case bite. I get better accuracy by using the LFCD over no crimp myself in my AR.
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