I mounted an older Leupold 2-7x32 scope on mine using the supplied rings. The objective clears the rail quite nicely but a larger, say 40 mm, bell probably wouldn't.
BTW, Ruger provides rings of two different heights, a #4 (the lower) and a #5. The #5 goes to the rear of the action. This was my first experience with the M77-type action and I fought the scope installation for much of an evening before getting it right. The owner's manual gives absolutely no indication that the rings aren't identical and makes no mention the order of installation. It took a call to Ruger to assure me that they hadn't made a packing mistake and how to install them properly.
Also, if you want to mount the scope higher Ruger offers higher rings and will exchange yours at no cost if you call and ask. Just be sure to get the two different height.