Performance
SAAMI pressure levels are actually set higher for the .221 Remington Fireball at 52,000 C.U.P. than for the .222 Remington at 46,000 C.U.P. This was done in an effort to compensate for the shorter pistol-length barrels expected to be used. Because of this higher pressure, in a rifle length barrel the .221 is capable of velocities equal to that of the .222.
Read more about this topic: .221 Remington Fireball
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