I must have bought counterfeit GP11. I never had better than 4 inches at 50 yards from a foam rubber supported bench rest. I forget whether I am using 4064 (I'll look later) or not, but a once fired frontier brass (in same K31) with a 150G Hornady Spirepoint loaded as far out as possible, and loaded one at a time. With the reloads, I am down to @ 2 inches at 50 yards, open sights, bench rest hold. Maybe the once fired brass is a tighter fit. Next I am going to try 16-20g of 2400 behind a poured Lee 312 150 g 308 round