Best group I've able to maintain at 100yds is ~0.25" with a Bushmaster Varminter. By the math that works out to 2.5" at a 1,000. BY THE MATH. In the real world I doubt my shots would be in the right state and I would count myself lucky just to hit a man-sized target especially with the 5.56 varminter at 1,000 yds. 1k yds is whole different ballgame and 5.56 would be all over map due to drop and wind effects.