Need help with a scope mounting problem on a 6.5x55 swedish mauser

staffordshires2

staffordshires2

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I just got a 1916 Carl Gustaf 6.5x55 Swedish Mauser.
Now my issue is that someone before me drilled and tapped it for a scope.
They didn't drill the holes exactly parallel with the barrel, the rear mount looks to be over center to the left. I put on a rifle a scope, and have to crank the scope to max left setting to be one inch right of my target at 100 yards.
Are there scope mounts that are drilled a bit off center to correct this problem? And would I have to get(if there is such thing), a rear mount that is offset to the left to compensate for this error?
Thanks all in advance, since I really like this rifle but this issue has to be corrected.
 
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Leopold bases? Is there a special name for them? Or would you know where I could find some?
You made my day much more brighter with this information, thank you! This rifle groups so nicely it would be a shame that I cant sight it in properly.
 
There are different solutions to the problem. One is you can have a gun Smith re-drill and tap with the next bigger scope base mounting screw size. That may work if the old screw holes are not to much out of alignment.
Another solution is the to use windage adjustable rings as mentioned above. Millet used to make windage adjustable rings. I still have a pair of those.
 
Just about anywhere that sells firearms and optics should have Leupold bases I believe they make a 1 or 2 piece base for Mausers.
 
cosmic said:
If you already have Weaver bases on the rifle, then Millett rings are the easiest solution.
Click to expand...

X2!!! I have Millett rings on all my rifles. When I mount a scope, I ensure that the lateral adjustment is on the zero (equal amount of adjustment either left or right) and then bore sight the crosshairs using the lateral adjustment on the rings. Fine tuning allows me lots of room either left or right to get my glass zeroed.
 
Yes, if you have Weaver style bases on the rifle, the Millet ring has lateral movement. This will allow you to set the scope to the middle of the travel and then rough zero the wind on the range using the left-right movement on the rear ring.
 
Misalignment will ruin your scope tube. There are tools and methods to adjust alignment and check it so you are not bending the scope tube.

The scope tube was not meant to accept the stress of misalignment.

See the below kit. A 1" bar that you clamp in your hopefully aligned rings to make sure they actually perfectly line up.

And the 2 bars with points that when you tighten them in the 2 rings, the 2 points meet perfectly.

And look at the Sinclair setup.

Plus which, making sure the rings are aligned with the bore.

The Burris Signature Zee rings are good but checking the ring alignment is important.

This is one thing I really like about 1 piece mounts/rails.



https://www.midwayusa.com/product/2130187492

https://www.sinclairintl.com/optics.../sinclair-scope-alignment-tool-prod36960.aspx
 
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If you get a "kit" - might want to understand how to use the tools - the points are to help assess up and down alignment, not left to right or "concentric". Do a thought experiment - twist rings each to 30 degrees or 45 degree out of "in line" - then install the pointy ended things - the tips will still line up. So, turn them around - use the blunt squared off ends - only when there is no gap, or a perfectly even gap (top to bottom and left to right) are the rings in perfect alignment. The rings and bases may or may not be perfectly true; the buffing / polishing on the receiver top may or may not be "true", so eventually see a correctly "aligned" ring tipped forward/backward - can be caused by the ring, by the base or by the grind on the receiver. Up to the installer / user to decided what is "good enough" - can involve shimming, epoxy bedding, lapping, etc. And I am sure there are a bizzilion rifles out there with the bases cranked onto the receiver, rings onto bases and scope into rings - no idea or care if they are "perfect", and by and large they work fine, until removing the scope and discovering the ring marks caused by mis-alignment. Other than a burr or other machining roughness within a ring, I don't think there is any other cause of ring marks on scope body, except mis-alignment.
 
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A recent "adventure" - that rear base is about .010" higher than the front base. My current conclusion is that the scope tube had been previously "bent". First picture after tightening up the front base cross screw. Second picture is tightening the rear windage screws with the front base cross screw removed. Beuhler bases and rings. The tops of the bases are as perfectly parallel as I can measure - rear one is higher, but exactly parallel, and as close as I can measure left and right - I was trying for a deliberate "cant".

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the two points meeting only mean you are close. turn the bars around so the flat ends, which should be cut perfectly square., meet perfectly, same gap all around. then your rings are aligned.
 
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