Excellent point. You will notice when you pattern that the shot is most certainly not all the same size. How they determine what is #6 Hevi and what is #4 Hevi when its all mixed up is beyond me. Also, hevi shot is not round, but more of an egg shape or rough pearl shape. This probably effects the way it patterns. I have found that it is very very picky about chokes and guns it likes to shoot well out of. Hevi-13 isn't quite as choosy, and it seems like Win Elite extended range shoots great out of almost everything I have put it through.