Re: Scope almost out of adjustment?
I just traded for a 308 Savage rifle on this forum. When I got the rifle and was checking it out, I found that the pin which locates the recoil lug had not been properly installed and was too long and too skinny and actually projected from the recoil lug on the barrel side. The end of the pin was sharp, as if it had been sheared and that sharp edge was sticking out like a cutting tool... When the barrel nut was torqued down, the projection of the pin gouged a shaving out of the nut and as the nut advanced the chip got bigger and bigger. It finally reached a point where the person torquing the nut thought it was tight, but in fact it had just locked up on the chip.
Later, when the rifle was fired, the forces acting on the barrel must have loosened it up slightly and although the nut could not rotate, the barrel could rotate inside the nut. This must have caused a bunch of problems (changing headspace, barrel harmonics etc etc).
If I recall, you do not have a Savage, but if this had been a Remington with a barrel shoulder, the pin could have gouged a chip out of the barrel shoulder instead and something very similar could have occurred. This was just a lesson to me in how things can go wrong in ways you really might not expect. I just today got my new NSS precision barrel nut and recoil lug which has a small cap screw instead of a pin, the head of the cap screw engaging in the groove in the reciever. It all fits very snug and of course the cap screw can't move axially and cause this problem... Now I'm just waiting for the "go" gauge to re-set the head space, then I will be all set.