hello gentlemen, I am shooting an r1 in 308 and am also having a hard time grouping. Ive got a Burris 4x12 50mm Euro Diamond scope with Leupold rings, Remington 150 grain core loct is the worst grouping ive tried best ive been able to achieve is with the Hornady 150 sst, interbond same grain, first shot out of a cold barrel is usually right on the money, anyone tried black hills or ballistic silvertips?