The CB long cap is less powerful than a .22 Short as it contains little to no powder. I chrono'd some many years ago and they were making about 600 fps. Aguillia has introduced a .22 Colibri load (NOT for the Colibri pistol) that is primer only. They claim velocities of just over 300 fps. It is doubtful that ATF would be interested in banning this ammo because the reason suppressors were added to NFA '34 was a fear of poachers using them. The CB, CB long cap, and Colibri to not have enouch power to poach much more than a squirrel or rabbit and will not cycle in a semiautomatic firearm. The ATF is also currently allowing the Colibri ammo to be imported from Mexico.