Home Forums Hunting & Shooting AR and Tactical Rifles 1st shot out of group with RR Predator Pursuit

Yep, that makes sense.

Crimping might not have even been the whole issue, it might be related to the load being just on the edge of going nuts, and not in a a harmonic sweet spot, that either say half a grain or a full grain eithe rway would have had the same results.

Yeah, I agree.

I'm still wondering if the 1st round were chambered from a locked back bolt instead of the charging handle if that would make a difference also with uncrimped bullets? Just something that upsets the first round like all of the rest that get fired in the group. I dunno, it's just a SWAG on my part though.

Sometimes it's the little things that will frustrate the hell out of us. Most of the time it's my ability and not the rifle!

IMHO hot or cold, doesn't matter that much, stress is stress.

You have it solved now, but you could have the barrel relieved and go back to non crimped and it could have also solved the problem.

Or not.

I had a GAP 10 and was getting lousy groups from 175g FGGM. At one point during my shooting session, I pulled a loaded round from the chamber and pulled the bullet out of the case in the process. The inertia from the bolt closure had moved the bullet forward into the barrel where it became stuck. (Just like a kinetic pullet puller.) For whatever reason, I had a batch of FGGM with inconsistent neck tension and was getting inconsistent COAL during chambering.

Solution: Once the gas system has been tuned, the solution is to crimp or increase neck tension.