I did a test with all three 4350's in a 26" barreled 30-06 all loaded the same weight charge 58.0grs.I was using a WLR primer,Winchester case,168gr Nosler BT.A-4350 produced the highest velocity @2918fps,followed by IMR-4350 @ 2907fps and last was H-4350 @2889fps.All three groups were under 3/4".Best group was from A-4350,followed by second best IMR-4350,followed by H-4350.Case fill.A-4350 filled about half way up the neck,IMR-4350,about one quarter the way up the neck and H-4350 was at the bottom of the neck.Powders can vary from lot to lot,but this was my results.