Bug,
I have a Bushnell Magnum phantom 2.5 mounted on a 22LR barrel using the same mount that was designed for the T/C RP scopes with the rail. It works just fine for me. I also have the a TC lobo scope mounted using the same mount on a 357 mag barrel, that is a little more tricky, but still works.
Hope this helps,
regards,
Graycg