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Post by lugnutz on Sept 13, 2017 22:16:49 GMT -5
Had my 870 drilled and tapped, built for spot/turkey shoots. Put a 4-12x50 Vortex on it. I've plum ran out windage. I doubt it's the scope since its brand new, and the recoil from the 36" bull barrel makes the recoil non existent. Is their a way to check if it's been drilled incorrect or just crappy weaver steel rings? And if it's drilled crooked, what do I do to combat that?
Thanks in advance on your thought!
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Post by bullseye69 on Sept 14, 2017 5:30:51 GMT -5
You can take the scope base off and take a long straight edge and line it up with the drilled holes and see where it ends up with the end of your barrel.
Ifs its straight then its the rings. Would have to have it re-drilled if the holes are off, new rings or scope base if they,the holes, are ok.
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Post by esshup on Sept 14, 2017 7:59:36 GMT -5
Buy the Burris Zee Rings. They have plastic offset inserts in them and you can use the offsets to get the scope windage back to the center of the windage range.
The bad thing about drilling and tapping the receiver is that every time you take the barrel off you will have to re-zero the scope.
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Post by Woody Williams on Sept 14, 2017 8:25:36 GMT -5
...... The bad thing about drilling and tapping the receiver is that every time you take the barrel off you will have to re-zero the scope. True... even a major bump on the barrel can change zero. I have my scopes on my 870s on cantilever barrels.... |
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Post by stevein on Sept 15, 2017 14:47:18 GMT -5
To check for center I would put the receiver on a flat surface and use a height gage to check hole locations, I do this at work for quality. I doubt many gunsmiths have this equipment though.
A good machinist could figure out how much the POI is from the scope at center of windage. Move the holes in the mount that amount and check. You need to be precise on distance fired and and the difference in pattern center. From there it is all trig. OR you could bend the barrel ( maybe straighten) with the scope centered. Guys shooting smoothbore muzzle loaders do this all the time to get their groups where they want them shooting round balls.
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Post by steiny on Sept 18, 2017 8:17:42 GMT -5
Sometimes you can "shim" a scope if you've used up all of your adjustment.
This is done with a thin piece of material between the scope and ring to angle the scope slightly.
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