I have a friend who has about 15 deer with the Wasp Jackhammer SST 100 (3 blade mech.) These heads have a 1 3/4" diameter cut. He told me he' s had one deer go 100 yards but all the rest average out at 30-35 yards! He told me if you have good KE, shoot a large cutting diameter head, the blood trail is unbelievable!!!! So at the beginning of the season I decided I was going to try them. He wasn' t kidding! I shot two deer with it and the blood trails were much bigger than I' ve ever had with a shotgun slug! If fact the big buck (235 dressed) I shot had a double blood trail (entry side and exit side) 2 feet apart. Each trail averaged 5" wide. I told him my success and he just laughed and said I told you so! The first deer I shot a medium doe went through the shoulder bone and still fully passed through the deer. Once agian an unbeilvable blood trail! When you see these entry and exit holes you just say wow! My KE is about 63. If you have the energy look hard at this head its tough and devistating!