There’s the .17 Javelina and .17/222, the .20 Tactical and .20 VarTag, the .222 Ackley Improved, 2.22 Magnum Ackley Improved, and 6×47 Remington. From SSK Industries we have the .221 Fireball reworked ...

Some of the best powders for reloading the .221 Fireball are (from left), Hodgdon CFE BLK, Reloder 7, and Vihta Vuori N-130. Pat Mundy .221 Remington Fireball Powder Options Propellants for the ...

Remington’s engineers determined that the 1.700" case length of the .222 cartridge provided too much capacity and thus extraneous powder burned outside the gun.