Re: scope problems
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The inserts are about $10, if you need 40 moa you will need 2 sets since a set includes 5,10, and 20 moa adjustments the most you can get from 1 set would be 30 moa (approx.)
I have had them on a 300 win mag for a little over 2 years and they haven't budged at all. However Rics right from what I hear Badgers are about as solid as it gets, there have been reports of the Burris rings slipping on the big boomers.
P.S. If you go the Burris route be sure and clean all the oil off the rings AND inserts, less chance of slipping that way.
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I think you will find 40 MOA not quite possible.
the inserts are marked in 0.001, not MOA, with .020 cant, the rings would need to be separated about 3.5" to get 20MOA
at the normal spacing, say around 5" the 20thou inserts would only gain you about 14MOA
at 4.5" spacing = ~15MOA/set of 0.020 inserts
so if you put the +- 0.020 pairs front and back (in the correct orientation) you will be closer to 28-30 moa added.