If you want to swap scopes and have 1 good scope, it can be a pain in the butt.
If you have a reputatable gunsmith nearby, and if your rifle is a Model 77 (not a newer Ruger American, or Hawkeye model), I would go this route...
Ruger M-77 Long Action Picatinny Rail Mounts (MUST DRILL & TAP RECEIVER) 0 MOA: EGW Gun Parts
And these rings, in steel, 30mm, and medium height, as they are in stock currently.
TPS TSR Picatinny-Style Rings Matte
Then you would have an extremely nice, and practical setup for your Ruger action.
The reason you need a good experienced smith, is because he will have to drill and tap the top of the reciever for the bolts. It would honestly be worth the money to do, because at this point, you are stuck to buying proprietary Ruger rings, which are often hard to find, and expensive. If you go this route, you are open to ANY rings designed to fit a 1913 picatinny rail. Which is a HUGE market compared to what you are extremely limited to right now.
If your rifle is a newer "Ruger American" model rifle, EGW also sells picatinny bases that fit those models, as well. But they are not the same as the one I linked you to, because the one I linked you to, is for a Model 77.
Here is one for a "Ruger American" rifle... In case this is what you have and not a Model 77.
http://www.egwguns.com/index.php?p=product&id=1361