I want to replace my scope rail. I ordered a night force 20 moa. It came with what is suppose to be the correct mounting screws 6 X 48. They are way too small. So I ordered 6 X 48 and 8 X 40 screws. Neither fit. #6 is too small a diameter, and the #8 is the correct diameter but the wrong thread pitch.

The Gun:

Savage 110 FCP in 338 Lapua Magnum. Bought a year ago brandy new.

The receiver is a long action of course.

Everything I have read says 6 X 48 but they are so small you can remove them without unthreading them.

So are these things metric?