I'm putting together a 243 with an ER Shaw barrel. I have a Foster go gauge. With everything together it closes tight on the go gauge. When I chamber a round there is no resistance. Bolt seems loose to to me. I have taken it down a few times to check everything and get the same thing. I also have a 6.5x55 I built and took apart. Was going to put it back together but can't find my gauge for it. It was lost in the move I guess. I do have once fired brass for it and read some where about using it. Any thoughts on any of this? Thanks