Scope problems

bmitch300wby · 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.

Scorch · September 3, 2007, 01:38 PM

What kind of mounts?
What kind of scope?

wolverine350 · September 3, 2007, 08:37 PM

may have to do a shim job

bmitch300wby · September 3, 2007, 09:59 PM

Leupold Vari-X II, Leupold mounts, medium rings.

Martyn4802 · 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.

Martyn

Scorch · 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

Sir:
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.

September 3, 2007, 01:16 PM	#1
bmitch300wby Member Join Date: September 3, 2007 Location: Spokane, WA Posts: 26	Scope problems 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	#2
Scorch Senior Member Join Date: February 13, 2006 Location: Washington state Posts: 15,248	What kind of mounts? What kind of scope? __________________ Never try to educate someone who resists knowledge at all costs. But what do I know? Summit Arms Services

September 3, 2007, 08:37 PM	#3
wolverine350 Senior Member Join Date: November 27, 2006 Location: ponca city ok Posts: 746	may have to do a shim job __________________ CVA Kodiak Magnum .50 cal Marlin 981T 22LR Bolt Action Remington 770 Bolt Action 270 Thompson Center Encore 243

September 4, 2007, 06:09 AM	#5
Martyn4802 Senior Member Join Date: June 12, 2007 Location: Grayling, Michigan Posts: 737	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. Martyn __________________ US Army Retired NRA Benefactor Life Member JPFO

September 4, 2007, 01:50 PM	#6
Scorch Senior Member Join Date: February 13, 2006 Location: Washington state Posts: 15,248	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. __________________ Never try to educate someone who resists knowledge at all costs. But what do I know? Summit Arms Services

September 3, 2007, 09:59 PM	#4
bmitch300wby Member Join Date: September 3, 2007 Location: Spokane, WA Posts: 26	Leupold Vari-X II, Leupold mounts, medium rings.

September 17, 2007, 07:29 PM	#7
Harry Bonar Senior Member Join Date: December 5, 2004 Location: In the Vincent, Ohio general area. Posts: 1,804	scope & mounts Sir: 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.