Have you checked the primer pockets of the cases from the top load yet? Still tight?Tried some Superformance in 6XC today with 107 SMKs. Ran ladder test from 38gr to 43gr. Highest load ran 3250 SD 15.25fps. 42.5 most accurate at 3220 SD 6 fps shot .218 out of 28" Krieger 1:7.5 in 10-15 mph tailwind.
Have you checked the primer pockets of the cases from the top load yet? Still tight?