The 221 Fireball came into existence because the 222 Remington was not an excellent performer in pistol length barrels. That is why the XP100 was chambered in the 221. I owned a TC Contender barrel in 222 Remington waay back when. I won't say it was completely useless as a 10 inch pistol. But out of all the calibers I ever owned in my Contender collection. It was my least favorite. When Thompson brought the 222 as a carbine barrel. The difference was night and day. In the pistol variation, decent accuracy could be achieved but I never came up with a GREAT load. In the carbine form 21 inch barrel the opposite was true. It was difficult to come up with a bad load.
My take is the 221 is an excellent choice for rifle or pistol. The 222 Remington excellent choice for a rifle while adequate barely as a pistol.
My take is the 221 is an excellent choice for rifle or pistol. The 222 Remington excellent choice for a rifle while adequate barely as a pistol.