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The .22 TCM is based on the 5.56×45mm NATO case, shortened to match the overall cartridge length of the .38 Super. This design results in a cartridge approximately 3 mm longer than a standard 9×19mm round. The .22 TCM was specifically engineered for the Rock Island Armory (RIA) M1911 line of pistols, which also supports 9mm barrel swaps.
The 7 mm version first appeared around 1980, with the .25 caliber appearing in 1987. The larger calibers provide more downrange energy, and resist wind deflection better than the original .22 caliber (5.56mm) bullet, and the moderate case capacity of the .223 Remington works well in the short pistol barrels. [1]
Currently the info box shows 40 gr (3 g) Bullet weight, 2,800 ft/s (850 m/s) Velocity, 392 ft·lbf (531 J) Energy Using my energy calculator, 40gr bullet at 2800 fps velocity gives 696 ft-lbs energy, not 392 ft/lbs. Working backwards, 40gr bullet with 392 ft-lbs energy would need about 2100 fps velocity.
This is usually a result of extreme wear or outright breakage of firing mechanism components and can result in uncontrollable "full-auto" operation, in which multiple rounds are discharged following a single pull of the trigger. It is a problem not limited to old guns and may occur in any rifle, even those in good condition.
Armscor introduced a new proprietary caliber named the .22 TCM (Tuason Craig Micromag) based on the 1911 pistol. The cartridge is essentially a 5.56×45mm NATO cartridge shortened to 1.265 in. total length with a 40-grain jacketed hollow point bullet. Its main characteristics are its high velocity and low recoil, allowing for repeated accurate ...
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The .224 Boz began as a 10mm Auto case necked down to .223 in (5.7 mm). Original trials were successful, with this round firing a 50 gr (3.2 g) projectile chronographed at over 2,500 ft/s (760 m/s). [3]