Crimping precision rounds?

mzvarner

Sergeant
Full Member
Minuteman
Mar 7, 2013
510
379
Spokane, WA
Getting ready to start loading for a new AR 10 that I am treating as a "precision" build with the goal sub 3/4 MOA. A buddy asked if I was going to crimp in order to prevent bullet set back from recoil (we had a pistol chambered in 460 Rowland explode cause of this). I told him that my practice is to use a FL die w/ proper bushing that gives .002 neck tension. But that got me thinking if this is acceptable practice in a semi auto. I have loaded thousands of 308 and 6.5 Creedmore using this practice in bolt guns, but my AIAT is a much heavier weapon so it has very little recoil. Thoughts?
 
Increase the neck tension to be consistent. Crimping introduces a lot of variables and is more difficult to be consistent (i.e. brass thickness, trim length, etc.) For precision - consistency is everything.
 
If you do, use a taper crimp. Make sure cases are trimmed to a UNIFORM length to avoid problems. A light crimp is sufficient. Only use bullets with a cannelure.


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