I have both of those Leupolds.

The 6.5-20 is mounted on a TRG-22 in .308 and has great eye relief at any magnification. 20 MOA base and scandium rings by Near Manufaturing, US Optics Anti-Cant.

The 8.5-25 is mounted on a TRG-42 in .338 and the eye relief is fine at 25x - for me the scope is always a 25x, the eye relief changes are dramatic as magnification changes. 20 MOA base and scandium rings by Near Manufaturing, US Optics Anti-Cant.

Welcome to try them out at Pueblo West just about any Saturday that is not freezing.