It's no secret to most folks that follow my posting that I recommend Badger Ordinance rings and bases. There are others in the same category but the Badgers are easy to come by and the quality is great. The bases provide 20 MOA of taper and the rings 'return to zero' on removal and reinstall is very good. You can order then from Premier Reticle at 540.868.2044 they'll be in the 225 to 250 U.S.D. range. Richard Near and D. D. Ross also make these tactical style setups, Leupold also had the Mark IV series (there is no taper in the Leupold versions). The screws torque to 15 inch pounds and the ring attachment bolts are 65 inch pounds. They're a little heavier than most hunters use but they are NOT going to slip or get bumped off from rough handling. Leveling the reticle, use the little leveler device available from Sinclair International or use the carpenters level on the bases to level the rifle and then place the level on the top turret of the scope upon installation. I don't worry about it too much, I install the scope and rotate the scope so the verticle stadia points to the center of the Rem 700's rear bolt protrusion.