Bholt,
There are several things you do for your gun. I have a Ruger M77 MKII chambered in a 243 AI. This gun has been built from the ground up and shoots SUB .5 at 200 yards.
I went with our 20 MOA base,(70 $) and had my gunsmith drill and tap my receiver. Due to these receivers being incredibly hard, you really want to make sure your smith knows what he is doing. Once the receiver was drilled and tapped, I had the smith mill the picatinney base to sit on top of the receiver. I had him leave a small amount of tolerance so that i could bed the base to the receiver with Devcon.
It now looks great and shoots better then any Ruger M77 i know of. Shoot me a pm if you would like to see pictures or for contact info for the gunsmith who did mine.
All in all, i have about 200 $ in this setup.
Regards,
Ken