Originally Posted by
Hannibal
If you have a set of feeler gauges, you can see if the rings have any gap remaining if you check from the sides where the screws are.
You can also get Plastigauge from Napa or other auto parts stores and see if there is clearence left after ring/scope assembly. Just put a 1" piece along the bottom of the ring bases, set the scope in, and lay another 1" piece down before putting the ring 'cap' on. Torque the screws, pull the ring 'caps' off, and if the plastigauge is not squashed to oblivion, your rings are oversized/scope tube is undersized.