I shot a couple five round groups today. I would have shot more but I was really quite surprised by the first group so I only just shot another comparison group.
The first group I shot American Eagle .223 black box. The second group was American Eagle .223 black box "AR". The only difference is that the "AR" black box has a milspec primer designed for use in ARs so says the box. The AR black box is what I used to zero the scope.
The first group with the non "AR" box of ammo grouped about 3" wide, well centered but high on the target not even touching the bull. The second group I shot for comparison using the "AR" box was still wide but printed nicely around the bull and that primer I mentioned being the only note worthy difference. The non milspec primer is about $2 less a box too.
The first group I shot American Eagle .223 black box. The second group was American Eagle .223 black box "AR". The only difference is that the "AR" black box has a milspec primer designed for use in ARs so says the box. The AR black box is what I used to zero the scope.
The first group with the non "AR" box of ammo grouped about 3" wide, well centered but high on the target not even touching the bull. The second group I shot for comparison using the "AR" box was still wide but printed nicely around the bull and that primer I mentioned being the only note worthy difference. The non milspec primer is about $2 less a box too.