I6.5 PRC, and settled on a load that stayed super to a bit over 1900 yards.
That's where I'm @ w/7WSM and 162's, stays super-sonic bit over 1900yds. I could probably try different powders and projectiles to improve wind-deflection in particular, maybe stretch out super-sonic range, but I have quite a bit of '25 and a bajillion 162 A-max's. The longest place I have to shoot here regularly is 1250ish so what I've got is plenty.
My 7WSM is a 30" 1.25" no-taper Brux in a Shehane/McMillan on a Lawton right-bolt left-port single-shot action with a 12-42x56 Nightforce on top. It's ~19# and reasonable to shoot regarding recoil.
