Don't know if you're familiar with the show: "Myth Busters" on Discovery, but last week they were shooting a crossbow into balistix wax and there was quite a difference between the penetration of the 3 blade and 2 blade broadheads they were shooting! The 3 blade only penetrated 4-6 inches, and the two blade was 8-10 inches!!!!!!! Same bow, poundage, distance, shooter, everything. I was impressed. Had never thought there would be any, much less that much, difference in penetration.