RNettles, Burris, Leupold, Redfield, and M.P Buhler are all interchangable and use the same exact rings. The most sturdy mount is a dual dovetail, available from Burris or Leupold.
If you end up buying a new Ruger 77, it will come with one of the best mounting systems on the market. The 77 uses a mount similar to SAKO and is famous for being strong. 77s come with a set of medium rings that might be too short for that garbonzo 4-12X scope you have. You can exchange them for a high set if need be. Note: rings for a 77 are a bit strange because the mount uses a shorter ring in the back and a longer one in the front due to the receiver design. For low you use one low ring and one medium. For medium height, you use a medium and a high. For high, you use a high and an extra high. Sounds confusing until you see the system. The rings for a Super Redhawk revolver are identical.