I have a Pachmayr tip off scope mount, that uses a 6x48 screw with a 3/8" inch shank. But the top is 5/16's and flat, and BEVELED from the edge of the top/cap, to the shank. Someone, it appears has counter sunk the screw holes to handle this wider, beleveled head. I took the mount to a guy to photograph so I could post if for sale, and he lost 2 of the screws. Wondering if any one knows where I might find some. these referred to a Weaver style and are, kinda, but the bevel continues back up to the edge of the cap, rather than starting lower, and the cap is wider than a normal Weaver screw. any help will be much appreciated.

I believe you are, what the driver did to the screws.

Brownells sells long 6x48 screws. But what you're describing sounds like ordinary 82 degree machine screws. Have you tried a 6x48 screw in the holes to be sure the guy just didn't strip them and open them up to 6x32, 8x32 or some funky-metric-shit 82 degree machine screws?

http://www.brownells.com/gunsm...w-kit-prod41830.aspx

The head shape and length you describe sound like Ruger rib mounting screws, which technically I believe are called "flat head cap screws." Only problem is that the Ruger screws I have are an 8x36 thread. As above, are you sure of the 6x48 thread size? Other than the Ruger's, I can't find them anywhere in reference to firearms.

These are available from Fastenal in 6x40 and 8x36, but not 6x48.
https://www.fastenal.com/produ...ound6%20-%2040%22$|~