Originally Posted by gunners
I used the Berger twist calculator for my Hornady 53 gr v- max it says unstable @.74 but it also says the 50 gr v- max would be unstable too @.84. Marginal stability starts at 1.0 with optimal being 1.4. Another more comprehensive calculator gives me 1.1 for my 53's. I figure if it shoots a- maxs alright it should be ok.
683 yards on a Pd is some pretty fine shooting. My barrel is probably just over a 1000 so not worth a rebarrel yet. I really want to get to the range and try them
Keep in mind that the Berger calculator is at its best with conventional jacketed hollow points. JBM Ballistics has a twist calculator that takes into account the plastic tips, which can have a big effect on the required theoretical twist. Their calculator can be found here:
JBM - Calculations - Stability
One other thing to consider is that there is a sizeable difference in length between the 52 grain AMAX and the 53 grain VMAX. The AMAX is very close in dimensions to the 50 grain VMAX. The 53 VMAX has a very aggressive nose, using the same profile as the nose on the 75 grain AMAX. It is longer, overall, than the 55 grain VMAX.