I agree, same maker for both rings and bases is sound advice. You might want to also think about material and weight if you plan to carry your rifle a bunch. Talley also is known for its rings & bases. I think my next set will be a Talley quick detach model. Lots of folks run the Leupold Mk 4 rings, and several other well know brands out there, most any you pay more then $100 for should do you right. I ran the .243 on the exbal ballistics program with a Barns Solids 75 gr Solid, temp 59, altitude 0, fps 2600, Relitive humidity 78%, sight-in distance 100 yrds, sight above bore 1.5 in, and you get 1000yrds needing 56.50 MOA. With a 90 moa scope you will have 16.75 left up if you are centered at 45 moa when it is on the rifle. You might think about getting the 20moa base to give you more usable windage adjustment in the scope since you will be towards the top of the scope acr with a 0 moa base.
21 year Navy Vet.