Here's a pic of my mod 10 predator. It's a 50mm scope, 20 moa rail and the barrel is only slightly smaller than yours that close to the chamber.
I actually had this set up on a mod 12 and it was very close to the same.
These are Leupold Medium rings. If you go to the Leupold site, it should tell you the height of these as measured in thousandths of an inch from the center of the scope. The difference between the Med and Low rings would tell you how much lower it's going to be.
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