416 Taylor with AA 4064 at 69 grains under 400 grain TSXs. I understand the AA version needs a grain more than IMR 4064 to achieve the same velocity. The AAvversion looks like a shorter cut stick than IMR 4064.
After dumping the powder, I spin and tamp the cases on the bench to remove voids and condensate powder column in the case. I even tamp the cases with partially seated bullets as it gets close to the powder. I cannot get loaded bullets close to magazine length, single feed yes. The caliper bumped up but OAL was 3.4845”.
If AA 4064 is a shorter cut IMR 4064, how do you get 69 grains of I4064 in the case? Something’s not right.
Brass is Norma
Bullet is 400gr TSX
Remington 9.5 primer (shouldn’t matter)
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