OG, another option would be to install a rail. Then you could use whatever weaver-style rings your little heart desires, and not be tied to the proprietary Ruger rings. If you plan on any long-range shooting, the ruger rings suck. Put-cha a 20moa rail on and get rocking......

Ruger M-77 Short Action 20 MOA (MUST DRILL & TAP RECEIVER) Ambidextrous: EGW Gun Parts