My browning mediallion does the exact same thing 100% of the time. Always drops lower left 2"on third shot. But if I let it cool, I get .5" groups at 100 yards. So I know that something is probably binding. My choices are, rebed, and possible screw up my accuracy, or live with it, and know what you got. I decided, nothing wrong with 2 shot groups for a strickly hunting rifle. And then again, it may be barrel and way its fitted, and then it gets hot and on the third shot, you get a flyer. So bedding might not fix it. With these pencil barrels, things like this happen.