- Sep 5, 2009
- Reaction score
So I picked up a few boxes of .223 and sighted it in. I'm getting like 10 inch groups and 100 yards. The bullets were 55 grain. If I get some 556 ammo in a heavier grain, should my groups get tighter? The twist rate is 1 in 8. Barrel length again is 24 inch bull. Have any of you experienced this?