Thread: Rem 700 help

Have a mates remington 700 5r 300wm that was shooting great but is now chucking the bullets around only about 300 rounds down it. We've tryed no suppressor, changing scopes and mounts copper clean and no change. I haven't pulled it out of the stock that is the next move. Is there anything else anyone can think off that might be causing the problem. Any suggestions welcome thanks team