I just purchase an M4 this weekend and noticed it says low recoil loads on the barrel. I purchased this gun for shooting coyotes and use pretty stout loads (3" Dead Coyote loads from Hevi-Shot) will I damage this gun. It is marked 2 3'4 and 3" on the barrel. I would assume that the 3" means magnum and therefor would seem not to be "low recoil". To say the least, I'm confused. It I can't shoot the heavy 3" loads I may have just wasted my money. Please tell me I didn't.