I went to the range this afternoon with my Browning BAR 7 mm rem mag. My first 20 or so shots went perfectly. Every one punching within a couple inches of the bullseye at 100 yards. I switched ammuntion after the first 20 shots, to a bullet with a plastic ballistic tip and then my shots started flying off all directions. Even the remington soft points I had originally had accuracy with. I checked my scope, rings and base and everything felt secure. The only thing I can think is that the barrel may have gotten too hot and started causing accuracy problems, but I don't think that would have thrown off my shots by 10+ inches at 100 yards but maybe I'm wrong. Anyone have any ideas or experiences like this?