Here's a target plot of a 30-shot group testing a new 30" 1:12 twist barrel.chambered 30-338 Keele fired in the early 1990's. Shot from the prone F class position rifle resting on 3 bags of rice. First shot was with a 190 Sierra HPMK, all 190's in full length sized once fired cases. Second shot with a 200 Sierra which all were in new cases. Then alternating loads to see how each would shoot across 30 shots, 15 of each load.
X ring is 10 inches diameter. Red dots plot the 200's, black dots for the 190's.
View attachment 180427