Originally Posted by TWR
Originally Posted by MontanaMarine
A 20 yard zero should work out pretty flat to 100 yards.

I ran a generic traj table using 124gr XTP at 1400 fps, with sight 1.75" above bore.

[Linked Image from i.imgur.com]


But remember the AR is 2.7” above bore and that should make a difference.

When I had my Colt, I zeroed at 50 and never had any problems up close or at 100.


That makes perfect sense to me.

When I ran the chart, my mind was thinking along the lines of a Ruger PC Carbine.