On the rings--I'm no help(because I put Talley's on all mine). But 40,42,44 will work--I'd bet.
I have a 4X12 Leupie on mine, and could get by nicely with a 3X9. If you do a lot of target practice, get the 4X12. If you are just going to just get it sighted in, then hunt with it, the 3X9 is your scope.
