I am in the process of building a 260 on a long action with a new Criterion barrel. The last three builds I have done have also been on long actions and I have not encountered this problem.

I am trying to head space the barrel with a case, which I have also done in the past. The problem is with either the new recoil lug or old recoil lug, I can not screw the barrel in far enough. I have the lock nut screwed all the way towards the muzzle but the nut bottoms out on the reciever before the case is seated into the bolt face. The only way I can get the case to headspace is to take the recoil lug off completely. Then I only have about 1/16 of an inch to tighten up the lock nut.

The thread length on the new barrel is the same as the old barrel. The lock nut is also the same length as on another rifle. I thought about grinding the lock nut down but I would have to grind it at least 1/4 of an inch.

I am at a loss as to what to do or what to look for. Can ya'll help me with some ideas?

thanks