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A 6.5x55 Match Rifle
Page 8 - "Tapering" the Base (Rings)
I am entertaining thoughts of using this rifle at 1000 yards. This will require that quite a bit of elevation be available from the scope. When zeroed at 100 yards, I found I could turndown the scope another 15 minutes (120 clicks) or so. These 15 minuets of elevation were of no use to me, and, having paid for them, I wanted to be able to use them. So, I decided to "tilt" the scope downward by removing some metal from the bottoms of the rings. But I couldn't just lower the front ring, I had to "tilt" the rings so that the bores of the rings were "in-line".
The rings were clamped to a piece of pipe, turned to 1" O.D., and spaced as they were on the base. By clamping them on this mandrel, I am assured that the bores are "in-line".
Using a little trigonometry, I calculated how much lower the front needed to be.
Then I stuck them in the mill, upside down, and stuck a feeler gauge under the "front" ring. The feeler gauge was as thick as the dimension produced by my math exercise. Then I took a skim cut over the ring bottoms. The cut on the un-shimmed ring was pretty light, but the cut on the shimmed ring removed as much as was removed from the first, plus the thickness of the shim.
This worked well with the Tasco rings, but won't work any of the more common Redfield style rings.