Why won't my t3 group with 75 grain AMAX's?

prosper, you can check my post for load ideas for the 75gr Amax. Should work better then the results you are getting with either Benchmark or Varget.

If you are using a reg primer, consider switching to a CCI 450 sr magnum primer for the fall.

I was getting superb groups when it was warm and things went south the more I tested. The only thing left was ambient temp which has fallen alot since I started.

A switch to the magnum primer and flyers have gone away and accuracy has returned.

I needed to back off my powder loads about 1/2 gr. Just start working up again.

Might help.

Jerry
 
Wow, I just got back from the range today.

I had 30 rounds loaded with the 75 grain A-max, over 4064, and Benchmark lit by cci 450 magnum primers. 6 groups total.

At 200 yards, I shot two sub-inch groups (five shot) and 3 more groups that clustered 4 into under an inch with a single flyer
 
I was going to suggest that going with non-moly might enable a bit more grip ergo spin and possibly stabilize things but looks like you have it sorted out. Nice!
 
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