It is kinda interesting that when Hoyt came out with the cam 1/2 in 03,the Ultratec and most of their bows had a radius on the back of the grip(very similar to Bt).I had some really good days with that bow but it was really hard to stay consistant with that grip.Seems like I heard that the Hoyt pro staff threw a fit about the grip and they changed them the following year and they haven't changed it since.Even on the hunting bows with wood grips.If you remove the grip,it is the same flat grip.