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jim boyd's picture
Grand Slam Challenge Winner!
Joined: 07/06/2010
Posts: 889
Scope Shims?


I am working on a horse trade on a model 700 in 30.06.

Blue / synthetic and it has a older Leupold 50 mm scope on it - but the guy says there is a .020 shim under the rear mount... he said he could not get the elevation set right on the rifle.

The mounts appear to be standard Leupold mounts... with the twist and lock mount in the front and the rear mount has the two flat blade screws for locking and windage.

What would cause the need for the shim?

He says he started with the scope in the middle of its adjustment and just ran out of up and down adjustment (could not get the bullet to strike high enough on the paper).

What causes this?

I would not have noticed the shim unless he told me about it...

Please help - this could be my Colorado rifle!!!


Tndeerhunter's picture
Grand Slam Challenge Winner!
Location: Tennessee
Joined: 04/13/2009
Posts: 1136

I've mounted scopes on literally dozens and dozens of different rifles and have never needed a shim for any of them, never. Some simple things that might have caused this problem could be something as simple as mis-matched rings and bases. If someone used rings to mount a scope that might have had differing heritage, it could be very easy to imagine very slight differences in actual height those rings gave.

It's a well known fact that one brand of medium ring is not always the same height as another brand of "mediums". Perhaps that might be the cause.

Even though it's a Leupold and they are well known to build high quality scopes, the scope might also be defective. For the record, I've never owned a Leupold that failed in any manner, but never say never.....

How new is the rifle? Unfortunately, I've read several comments lately about Remington made products that have not been "up to snuff", quality wise. It will only take you about 2 minutes on a popular lever gun owner's forums to read lots of bad things about that company's new owner. (happens to be Remington)

As I've already mentioned, I've simply never run into a rifle that needed that type of mod, but I also normally purchase new, quality rings and bases for any rifle, new to me.

Good luck!!  Thumbs up

jim boyd's picture
Grand Slam Challenge Winner!
Joined: 07/06/2010
Posts: 889
Great point about the

Great point about the potential mismatch in bases or rings - I had not thought about that.

I have had several 700's and they were great rifles.

I too have had wonderful success with Leupold products - they are great and their customer support is superior too.

I will wait and see what happens with this contest for the 300 and then decide on whether or not to pursue the 30-06 - I need (OK, want) and elk rifle!

Topgun 30-06's picture
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Location: Allegan, MI
Joined: 12/11/2010
Posts: 693
If he couldn't get it to

If he couldn't get it to adjust up enough to get the bullet on zero, why would he put a shim UNDER the REAR mount?  That makes no sense unless his problem was just the reverse of what you are saying he told you.  If you get a good deal on the outfit, I would just take the scope off and start all over even if I had to replace the mounts.  I think the dual dovetail system Leupold has available is better than that rear adjustable one that is on the gun now anyway.  You may just be able to replace that rear one and take care of the problem if, in fact, the guy knows how to sight in a scope in the first place! 

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