What cartridge? While I understand the aggravation, why not run a 20 MOA base or ring setup?

With a flat base 2.4 mils gets you 400-450yards or so with a 308 and 168s. Adding the 20moa will get you past 600.

With a 280AI velocities 2.4 will get you past 500. 20 MOA base pushes beyond.

What are you trying to achieve with a hunting scope and rifle?