Well that certainly clears up the issue regarding ammo........ just remember Gil, Target shooters get really anal about ammo, some have reloading rooms.......... the easy option would be to send a .308 reamer down it.

My mate had the same issue with a 7.62 x 51mm target rifle and the bolt wouldn't close or had real problems on normal ammo, I opened it up with a .308 and no more issues.

Peter at least now its one variable that can be taken out the equation, with correct loaded ammo or opening up the chamber would be a starting point.....