I sort of wish Hornady would also make a 20 HMR rimfire.... I think it would be a better round than a 17 HMR due to having a heavier bullet.... with performance between the 17 HMR ( 2550 fps MV ) and the 22 Mag with the 30 grain plastic tip bullets ( 2200 fps MV)
i believe that it is called the 5mm rimfire... though it is not made by Hornady at this time yet...