View Full Version : Scope problems

September 3, 2007, 01:16 PM
I recently loaded some test rounds for my 300 Weatherby and all of my 3 shot groups, grouped very well. My problem is, they were all about 3" low at 100yards. I attempted to adjust my elevation and found that my turret was maxed on elevation. I want to be about 3" high at 100yds. Does anyone have any suggestions about how to fix my problem? Thanks in advance.

September 3, 2007, 01:38 PM
What kind of mounts?
What kind of scope?

September 3, 2007, 08:37 PM
may have to do a shim job:)

September 3, 2007, 09:59 PM
Leupold Vari-X II, Leupold mounts, medium rings.

September 4, 2007, 06:09 AM
I think Burris signature rings, the ones with the adjustable inserts, is a better route to go than shimming.
When shimming the front base, you have to worry about ring alignment. The front ring will be elevated, and its centerline will be sitting in a higer plane than the rear ring. This puts stress on the scope tube after installation. Lapping is the answer to that, but it takes a whole lot of lapping to get the two rings in alignment.


September 4, 2007, 01:50 PM
Actually, he will have to shim the back, and according to what he said, it would have to be shimmed quite a bit, maybe .020"-.030".

If it is a 1-piece base, no problem, just put a shim under the rear of the base. This will not affect the alignment of the rings if it is a 1-piece base. If it is a 2-piece base, I would just buy a 1-piece Leupold base, since it is cheaper than buying new rings.

Check the base to make sure it is mounted correctly, make sure there is nothing under the front of the base, including epoxy, LocTite, or whatever.

Harry Bonar
September 17, 2007, 07:29 PM
I don't believe in "shimming" anything on a rifle!
There is some sort of a problem in your scope, rings or bases. Remedy that and you'll be O.K.
Harry B.