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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. [4]
The .223 Remington (designated 223 Remington by SAAMI [4] and 223 Rem. by the C.I.P. [5], pronounced "two-twenty three") is a rimless, bottlenecked, centerfire intermediate cartridge. It was developed in 1957 by Remington Arms and Fairchild Industries for the U.S. Continental Army Command of the United States Army as part of a project to create ...
The .300 Whisper (7.82x34mm) is a CIP standard [1] cartridge in the Whisper family, a group of cartridges developed in the early 1990s by J.D. Jones of SSK Industries.It was developed as a multi-purpose cartridge, capable of utilizing relatively lightweight bullets at supersonic velocities as well as heavier bullets (200–250 grains) at subsonic velocities.
The .221 Fireball case shares the same case head dimensions (0.375"/ 9.53mm) as the commercial .223 Remington and military 5.56×45mm cartridges. The 7mm Remington Bench Rest case shares the same case head dimensions (0.470"/ 11.94mm) as the commercial .308 Winchester (as well as other cartridges based on that case; .243 Winchester , .260 ...
The Thompson/Center Ugalde, or TCU family of wildcat cartridges, was developed by Wes Ugalde of Fallon, Nevada, by necking up .223 Remington brass to accept larger bullets. The cartridges were developed for the Thompson Center Arms Contender single shot pistol, and are widely used in handgun metallic silhouette competition and handgun hunting.
Size comparison between .222 (left), .223 (center) and .222 Magnum (right) The .222 Remington was eventually eclipsed in benchrest competition by the 6mm PPC . When the US military was looking for a new smallbore rifle cartridge, Remington started with the .222 Remington, and stretched it to increase powder capacity by about 20% in 1958 to make ...