Re: Leupold M8 12X - 40mm Target Scope
From my understanding, the M8 12X Luepolds scopes have 55MOA on both windage and elevation.
.308 pistol, I am guessing you are in the neighborhood of 2,300 fps to 2,400 fps.
for 2,300 fps, Berger 155 gr. Match VLD, G1 B.C. = .439
a 500 yard zero yields 17.4MOA at 100 yards.
You should be fine...'course I was guessing on your velocity!!
Let me know,