I've only zeroed it at 100m but it is making 1 hole groups with the Hornady 120 AMAX loads and running about 2750fps. The 140 factory AMAX load goes 2550. I'm kinda done with long barrels.
Interesting.
Looking at some ballistics tables, the difference between your 18" barrel (140 @ 2550) and a more typical "long" barrel (140 @ 2950) is worth about 225 yards.
