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The cartridge is a necked-up version of the .22 PPC which is in turn based on a .220 Russian (5.6×39mm). [5] The standard bullet diameter for 6 mm caliber cartridges is .243 inches (6.2 mm), the same diameter used in the .243 Winchester and 6mm Remington cartridges.
While the 6mm Remington cartridge never took over the .24 caliber dual purpose market lead from .243 Winchester, it was successfully sustained in production for nearly six decades. [11] As compared to the 1950s, there is broader public insight and knowledge of ballistic information today. This has led to a greater appreciation of the 6mm Remington.
.224 Belted Express, formed from .30-06 brass; very few die sets were made by RCBS.228 Ackley Magnum, an improved 7×57mm Mauser necked down to .228 caliber (5.8 mm); bullets in this size are hard to find but provide greater weight than .223 caliber bullets, up to 100 grains (6.5g), without excessively quick twist rate.
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For handloaders, two versions of reloading dies were manufactured, early dies and later dies that conformed to SAAMI specs (cf .280 Ackley Improved). If barrel length and chamber pressure are equal, the .280 Ackley Improved is about 100 fps faster with all bullet weights than the standard .280 Remington.
Components of a modern bottleneck rifle cartridge. Top-to-bottom: Copper-jacketed bullet, smokeless powder granules, rimless brass case, Boxer primer.. Handloading, or reloading, is the practice of making firearm cartridges by manually assembling the individual components (metallic/polymer case, primer, propellant and projectile), rather than purchasing mass-assembled, factory-loaded ...
Generally, only new, unfired .223 Remington brass is used for handloading TCU cartridges to avoid the premature case neck splits that can occur when resizing previously-fired .223 Remington brass with TCU reloading dies. Done this way, TCU sized brass generally becomes as reliable for multiple reloadings as any other handgun cartridge case.
Therefore, the 243 Catbird is a 6mm-06 with a 35 degree shoulder and a 1.2mm longer case. [10] The .243 Catbird was developed by Jarrett Rifles to achieve 4000 fps with a 68-70 grain bullet. [ 10 ] [ 11 ] Actual performance tests showed the cartridge achieved 4100 fps with a 70 grain bullet, 3800 fps with an 85 grain bullet, and 3500 fps with a ...