Just joined your board. Bought a new 7600 in 308, always wanted one, and picked up a Weaver base mount for it. The screws with the mount were 6X48, the receiver was taped for 8X40. Used the shortest 8X40 screws I had and the action would not slide back because the screw were a little long. So I shortened them. The action works fine now and the rifle shoots well. Just thought I would mention and wonder if anyone else has experienced this. Thanks