SC and Ringman,
I just went through the mounting height deal with a couple of recent scope installs. The difference between a medium ring height and a high ring height in a Leupold ring is .770" to .900" or .130 if memory serves me correctly. On some rifles a set of low rings may work with a 40MM scope. Not sure what the low ring height differnece is but am guessing at another .130" or so. The O.D. difference is around .400" (10MM)making it roughly .200" in increased ring height depending on the brand of scope. I have found that going from a low to a medium or a medium to a high will get a guy from 40MM to 50MM in scope objective size on the same rifle. Hope this is what you were looking for.
Dave
