I know that the B-Square weaver style mount for the New Model Super Blackhawk or Blackhawk requires no drilling. It works off of the existing rear site screw hole and uses barrel clamps up front, surprisingly it withstands the recoil of some major hot loads so I believe it will do just fine. I did have to shim the rear machined screw that came with the mount 1/16, I paid $46.00 on Midway for it.