Scope shiming for elevation?

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paintgunner

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I mounted a side mound scope on a CZ858 and its shooting about 3 feet high at about 100 yards (the scope elevation adjustment is maxed out). The reason for this is had to drill and tap holes in the receiver to mount it and I must have been off a bit. Drilling new holes isn't an option so the only other option I've found is to shim the scope or the rings.

I've heard shimming a scope on the rings to adjust the elevation is only recommended for temporary and can damage the scope. I thought of shimming the rings to the rail but either way I expect it would have a similar effect on the scope tube.

Has anyone tried this successfully?
 
Try a set of Burris offset mounts, they come with a few different inserts that will allow you to correct your elevation.
 
So, to raise your point of impact, say 48" at 100 yards, and if your rings are 4" apart, you need to raise the front / lower the rear at total of about .050" (1.3mm). That is a lot. Then, you will need to lap the bore of the rings so they are in-line / concentric with each other, or they will bend your scope's main tube. Possibly done by placing a .050" spacer under front ring area and bedding entire bearing surface for the base with epoxy, then lap the rings. Might work.
 
Magellann said:
Try a set of Burris offset mounts, they come with a few different inserts that will allow you to correct your elevation.
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As Magellann mentioned try the Burris Signature Zee rings with the offset inserts. They work great and will not damage the scope at all. I would give those a try first. No need to fabricate a one-off solution in my opinion when those are already available.
 
The OP says he has a side mount, and I did not know Burris made rings for a side mount. A plus 20 MOA insert at front and a minus 20 MOA at rear would get him "sort of" sighted in at 100 yards.
 
^^^Thanks for the reminder on the name of the Burris rings, I completely drew a blank on them. I use them on one of my 22's that I use at the 200 metre shoot to gain the required elevation, and it works very well.
 
Potashminer said:
The OP says he has a side mount, and I did not know Burris made rings for a side mount. A plus 20 MOA insert at front and a minus 20 MOA at rear would get him "sort of" sighted in at 100 yards.
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Ok, I didn't read the side-mount part of the post....:confused:
Not sure what type of side-mount it is but if there is a rail you should still be able to mount to that just using the Burris Sig Zee Weaver style rings and then adjust the offsets as needed to get the correct alignment.
If there is no rail on the side-mount then your right they probably won't work for that application unfortunately. :(
 
You can not shim inside the rings... any shims placed inside the ring reduces the ring diameter and can dent the scope tube.

Plugging some of the holes and re drilling and tapping correctly is the solution. It may require a more skilled smith.
 
kc34 said:
As Magellann mentioned try the Burris Signature Zee rings with the offset inserts. They work great and will not damage the scope at all. I would give those a try first. No need to fabricate a one-off solution in my opinion when those are already available.
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I tried different solutions that did not work all that well until the Z-rings
 
guntech said:
You can not shim inside the rings... any shims placed inside the ring reduces the ring diameter and can dent the scope tube.

Plugging some of the holes and re drilling and tapping correctly is the solution. It may require a more skilled smith.
Click to expand...

I agree. Theres not much material to work with and I'd be worried about the integrity of the reciever wall.
 
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