You'll find that even different lot numbers of the same ammo will shoot different, so it isn't just the ammo brand. When I found lot numbers that shot good, I bought a bunch more so that I'd have a good supply before having to sight in a new batch. Also, found that trying a different lot number of a brand that didn't shoot well, as in the remingtons, could well be an excellent load. CCI and Federal both have HP and BT loads, now, so be sure to try all of em, along with both Hornady XTP and CCI GamePoint 20gr loads. Overall, once you have several hundred rounds thru the bore, you'll find that it shoots all brands more consistent, but still different.