Porting. Went on a duck trip and the two of us had to share a tight blind with two other hunters. No problem. Them on the right side us on the left. A right to left crosser and we get a blast and noise from his ported O/U. Somehow on the next ducks his barrels got shot. Who knew HS would blow the end of his barrels off? And I don't believe that it's helpful in competition either. I could be wrong on the latter but wasn't on the former.