I have wondered that also. I can say I shoot my Bowtech cranked up at 72 pounds. I use nothing but Muzzy 100 grain 3 blades. I shot 7 deer this year with the furthest being 35 yards. Every shot was a complete pass thru and buried 4-5 inches in the ground. Even hit a doe angling hard at me and it exited out her shoulder on the other side. I cant say for sure what happens on some shots but its definitely apparent my rig is working second to none!