Check it at a closer distance. Center both your knobs. At 6-10' from muzzle the scope should be 1.5" above bore. If higher than 1.5" you need lower rings, if less than 1.5" you may be ok as the closer to the barrel you are the more up you have. On M40 sniper rifles the USMC machines a hair off the front of the solid Redfield base to get the scope a hair closer to the bore, that gives them more 'up' as they zero the.308 at 500yrd and shoot to 1000yrds(over the head under the b_lls).
Throw your boresghter away pull the bolt and look down barrel to boresight it the right way on your targeted garage wall, after you have the rifle level and plumb and all knobs centered. Remember at 6-10' to sight 'up' to the center + you use the down elev knob, to go down to the center you go up on the elev knob. At 6-10' from muzzle the scope knob direction is reversed(physics of light/lenses).
Doing it on the kitchen table works as well if wife dont mind the + you made on the wall with a permanent marker. The Redfield ( Leupold if you wish) ring mount system is a very good one and should cause no probs if you have the correct one of the 4 ring heights (super low, low, medium, high)Redfield made. The one piece Redfield base is waymo better than the two piece bases, but both or good. If the Redfield system wasnt good... thousands of M40 sniper rifles wouldnt have it. Less pieces less trouble.
Heck even Weaver makes a one piece base for bolt action rifles, and some even have the machine cutaway so the action opening isnt covered. But thats deeper in the Weaver catalog than most guys look. Heck the Picatinny rail is just Weaver base with more scope screw slots milled in it (wish I'd a thot of that instead of Unka Sam).
Oh yes and one more thing, endeavor to always stay away from shims. They are just .010" of trouble for a shooter.
Last edited by silvertip-co; 07-14-2008 at 06:15 PM.