I'm going to the range tomorrow to verify my co-witness on a new set-up. I like to zero at 50 yards, it works for me. I understand the theories behind 25, 50 and 100 yd/m zeros. I'm planning to use some high quality handloads to zero my rifle which I feel will be more consistent than XM193 (notoriously mediocre). I don't have 2,000 high quality handloads that I made on a single-stage press sitting in my closet however, and that's what I'll need to count when the world ends in May, 2012 or whatever. So at what range to you zero your rifle and what ammo do you use to do it? Happy Monday.