Try some 50's to figure out wtf if nothing else. If it shoots them good you know it's not digging the heavies. You're kinda backwards and being stubborn about it ain't gonna give you any clues as to what's up.
1-9" isn't a guarantee it will shoot 75's. My new Montana is 1-9.25" and won't in the cold foggy weather here. Did you check twist with a cleaning rod?
If you haven't bedded a rifle before I sure wouldn't wanna learn on one of these. Pretty sensitive little action. Mine was shooting pretty good but I bedded it and it's gotten worse. I did the best looking bedding job I've ever done too, but I screwed the pooch somewhere. Just my luck I guess.
