Ladder tested 300 win mag/240MK\'s and Retumbo
Loaded 20rds starting at 73grs. Went up .3 at a time. Quite a horizontal spread at 200m spread was 6". The 10th,11th,12th,and 13th. tucked into .380moa so I gues thats my "sweet spot"? The 14th climbed high and left and the 15th blew the primer so I stopped there. Not to much for pressure sign before that though. A bit of flattening and slight cratering. Federal Match primers. Win brass. I guess this is how its done?