My Remington Model 7 is a 20” 1:10 twist barrel. My best load for it is nothing crazy; 150gr Interlock with 46.0gr of Varget. Hornady Brass, CCI #200 primer. Shoots well under 1 MOA even with full length sized brass, I bet I could shrink groups further if I neck sized and played with seating depths, but without that it shoots more than good enough for me. Right now I’m just seating to the cannelure.
