Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits. Anti-spam check. Do not fill this in!==Performance== Despite its smaller size, the .221 Fireball is capable of velocities nearly equal to that of the .222 Remington largely due to its higher [[Sporting Arms and Ammunition Manufacturers' Institute|SAAMI]] pressure. The maximum SAAMI pressure level for the .221 Fireball is 52,000 C.U.P. as compared to 46,000 C.U.P. for the .222 Remington. The purpose of the increased pressure was to allow it to perform more effectively in the shorter barrel of the XP-100. The .221 Fireball produces the highest velocity of any commercial pistol cartridge.<ref name="chuck_free">[http://www.chuckhawks.com/221fireball.htm The .221 Fireball by Chuck Hawks]</ref> Summary: Please note that all contributions to the Military Wiki are considered to be released under the CC-BY-SA Cancel Editing help (opens in new window) Retrieved from "https://military.wikia.org/wiki/.221_Remington_Fireball"