ive got a remington M700 mountain rifle in 308 has a 20" barrel but with a 1 in 10 twist. totally stock rifle no bedding with a toothpick barrel that isnt even free floated. But it shoots excellent my current load for it is a 165 grain SST over 45.5 grains RL-15 in remington brass and magtech primers set a COL of 2.800" the load prints real tight! Im not real sure how to measure groups but all holes of 5 shots touch and could fit under a nickle.