To start the Hades program They wanted to offer a .22 in a grain to a wider user base which includes break barrels as well as PCP’s. I am sure that 18.13’s are coming. The 15.89 Hades are as accurate as its older domed cousin for in every PCP I fly them from. I have flown them accurately from 725 to 1028 FT/S from Daystate Redwolf HP, Huben K1, FX Impact X, FX Crown to Umarex Gauntlet. I love that round for any hunting 60 Yards and under.