Please Check My Math

MikeTz

Private
Minuteman
Mar 27, 2011
18
0
67
USA
I will be buying new rings to lower my scope on a SAKO TRG-22 and want to ensure I get the right height. The calculation of height for my rig is as follows:

Nightforce benchrest scope with 56mm objective has a bell diameter of 68mm. My picatinny rail top is 7mm above the barrel.

So 68mm/2=34mm plus 3mm for clearance = 37mm minus the rail thickness of 7mm is 30mm. So if I've done the math correctly I should need rings with height of 30mm or greater.

Can some of our experienced scope mounting experts confirm my math is correct and I haven't missed something.