Like Mr. Wrenn I don`t shoot heavy poundage. The Simmons design is proven and if you shoot 45lbs and up and 500 or more grains arrow weight I would not hesitate to use them on deer.The pic of the deer I killed with the big centuar is proof. The broadheads are near the same only the Centuar is 1 3/4 wide. I was shooting a 47@27 Widow longbow and 525 grain arrow.Arrow stuck in the dirt in the other side.The pig with the big snuffer sticking ouit of him was shot with a 48 @27 pronghorn longbow and 570 grain arrow. More than broadhead design it where you hit them. I`ve said it before...I`ve never lost an animal because of the broadhead I shot him with. The ones I`ve lost are because I made a bad shot.I have found animals that I may not have found using a smaller broadhead due to a lot of blood on the ground.Who knows.RC