thread size please

6-48.
788s were 8-40.
thank you

I have a BSA Monarch with old Parker Hale mounts (and rings are really hard to find with a 19.5mm dovetail) and I want to use a different mount. So I just wanted to confirm the thread size on the BSA (the screws from the 660 fit) and I'm not sure if the BSA was factory tapped or aftermarket tapped
So since they fit I need mounts with 6-48 screws

Thanks again
 
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