Don`t seem like you got much good input yet. I also am intrested in the .20 cal. rounds. I`ve been playing around with wildcats for quite afew years and have 6 wildcat that I shoot at present, smallest is the .17 AH and largest is the .411 Hawk. I`ve got 3 different .17 cal. rounds I load for and 3 different .22 cal. rounds, but nothing inbetween. I`ve got acouple of actions ready to be rebarreled, with different bolt faces and don`t know which round to go with. :?: