As I've posted in the past I've been messing around with turning a hacked up Ishapore Enfield into a scout rifle. The last was getting the barrel threaded and a brake installed. I want to be able to tune the barrel harmonics. After that I purchased a scope mount specifically made to replace the rear sight assembly. Using a laser bore sighter I found the scope to be at a significate angle to the barrel. So I bought a set of rings with inserts designed to correct this issue. Using the maximum offset, front and rear, the problem seems to be corrected. Only a range session, or several will tell if all is well.
The rings use polymer inserts, some with offset bores, and that can rotate to eliminate torque on the scope tube. The local gunsmith recommended them. This allows the cross hairs to be centered in the tube to improve visuals and eliminate having extreme cross hair movement.