Just bought a 450 Bushmaster with a Leupold 3-9x40 with adjustable turret on top. I sighted in at 100 yards, then put the adjustable turret on top. The next shot I took was at 160yards, set the turret to 160, shot a group, and they were all about 6-8" high and to the right. Not happy about that part, but moving on..
I noticed at home however that I can't turn the turret past 260yards. It just stops rotating at this point. I'm wondering if I didn't max out the adjustment on the scope and need to shim the front or back mount. But now my question is how much shim? I have access to all types of shim stock, but not sure if it's something as a little as .001" or .005" will do it. I have all the way up to .05" but figured that much has got to be overkill. So just wondering if anyone out there knows of an equation for shimming, so I don't have to waste ammo doing a trail and error. Thanks in advance everyone!