FWIW:

There is no way to know unless you shoot.

Here is a 2x2 post it note with 3 shots each at 25, 50, 75, and 100 yards.

All of these are from a 308 cal AR with a scope.

Its a 100 yard zero.

[Linked Image]

BMT

Last edited by BMT; 12/30/09.
"The Church can and should help modern society by tirelessly insisting that the work of women in the home be recognized and respected by all in its irreplaceable value." Apostolic Exhortation On The Family, Pope John Paul II