I'm trying to fine tune my load and ran into a dilemma. My gun has a green Mountain barrel, 1 in 70 twist .54 it seems to like 80 grains of swiss 2F. The problem is the patches are not having it. A load like 60 grains and the patches are perfectly intact. North of 70 grains and they just are not holding up. Attached are pictures of what I find from an 80 grain load. Im shooting .530 balls, .015 ox yoke prelubed patches. It seems like a decent fit, I need a starter but then it pushes down without much fuss. Groups are good for me, about an inch and a half at 50 yards.