Yeah, I think I just got a particularly inconsistant batch of the 55grain Remington... I say inconsistant because it grouped (poorly) in three or four different places with the same point of aim. And it wasn't consecutive rounds, either... that is, one round fly left, next right, next dead on, then right, then left again, then two dead on, then left, etc. etc. etc.
None of the other ammo I tried suffered this problem. Both boxes of the Remington exhibited it.
The best I've tried has been the 50-grain white box Winchester. Very very good groupings at 100 yards with that, no errant rounds, very very consistant.
I've had so-so results with Remington-brand .270 Winchester in the past also, but nothing as bad as the .223 I just went through.