Re: Rem. Sendero 7mm mag
There are several routes to go for your Sendero. You can use Dual Dovetail rings/bases made by Leupold and Burris. There are a pretty standard setup and very tough. The Leupold's don't allow for any built-in MOA but the Burris' do. You can get their Signature rings with the delron inserts. These inserts (for 1" tube scopes) come in several thicknesses (.005, .010, .020, etc.) with an insert kit also available (1" only). A set of inserts comes with the rings and the kit is sold separately. Very good system. While the 30mm rings do have inserts there aren't as many available as on the 1" rings.
You can also choose the STD ring/base system (dovetail up forward/windage screws back aft)made by Burris, Leupold, Millett, Redfield and Weaver. Again Burris has the inserts for these also. Leupold also makes a one piece STD base with 20 MOA built in but they are hard to find sometimes.
Then you come to the Mil Std 1913 or Picatinny style. These are made by several mfg's, with Leupold, NightForce, EGW, Burris, Ken Rarrell, Near Mfg, Seekings, Badger and many more I'm sure. IMO these setups are overpriced and unnecessary for standard hunting rigs. All it's got to do is hold a scope securely and most rings/mounts do this nicely without costing $300.00.
You also have the Weaver style rings/mounts which were with us from the git/go. They are sturdy, dependable and relatively cheap. Do a search on MidwayUSA and see what they have. Good luck in your endeavors. JohnnyK.