[oldgunfan]

I have a question about crimping, I have a taper crimp die for 223 but i'm not sure if I should use it on these bullets(69gr sierra match king). I will be using in an AR.

 

[JLA]

yes crimp. always crimp for autoloaders

 

[polishshooter]

I haven't shot the 69 gr Matchkings through my Rock River AR yet...

But I SLIGHTLY taper crimp all my .223 loads, including the 69 gr matchkings I tried through my Mossberg Predator, and they worked fine.

Except for the fact I can't FIND any more of them, I would shoot the same taper crimped rounds through my AR if I had any left.....

I taper crimp them all because of the fact both rifles feed through the same mags and I don't want any "set back" from recoil in the AR mags both use.


The ONLY rifle I do NOT crimp for is my Ruger M77 VR .220 Swift, which I have a "sled" installed so I use it as a single shot...I would crimp any round that I feed through a mag....

 

[oldgunfan]

Cool thanks, I'll use the taper crimp. I didn't think it would hurt anything but I thought I would ask first.

 

[243winxb]

Neck Tension-All Should Read

Read the part on neck tension here> http://www.exteriorballistics.com/reloadbasics/gasgunreload.cfm

 

[Shooter970]

I've shot several thousand rounds from ar-15's in several calibers and have never crimped and never had issues.

 

[howlnmad]

I'd invest in a Lee Factory Crimp Die, it'll prolong the life of your brass.

 

[Gahunter12]

I'd invest in a Lee Factory Crimp Die, it'll prolong the life of your brass.

I will second the Lee Factory Crimp Die. It's a true collet die that place a good collet crimp like most Mil ammo. I use a very very light crimp with the Lee FCD.