.22 TCM

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22TCM
TCM FN Rem.jpg
From left: .22 TCM, FN 5.7×28mm, .223 Remington
TypePistol/Rifle
Production history
DesignerFred Craig
Specifications
Parent case5.56×45mm NATO
Case typeRimless bottleneck
Bullet diameter.224 or 5.56mm
Base diameter0.376 in (9.6 mm)
Rim diameter0.378 in (9.6 mm)
Rim thickness0.045 in (1.1 mm)
Case length1.022 in (26.0 mm)
Overall length1.265 in (32.1 mm)
Case capacity15.2 gr H20
Ballistic performance
Bullet mass/type Velocity Energy
40 gr (3 g) Pointed flat nose 2,800 ft/s (850 m/s) 696 ft⋅lbf (944 J)
40 gr (3 g) Pointed flat nose 2,070 ft/s (630 m/s) 381 ft⋅lbf (517 J)
Test barrel length: 22.75" rifle (higher velocity) and 5.0" pistol (lower velocity)
22 TCM case details

The .22 TCM or 22TCM (.22 Tuason Craig Micromagnum) is a proprietary bottle-necked cartridge created from a 5.56 NATO cartridge developed by custom gunsmith Fred Craig and Rock Island Armory (RIA) for semi-automatic pistols and the Rock Island M22 TCM bolt action rifle. Before the cartridge was commercialized, it was called the 22 Micro-Mag. Similar conceptually to other bottle-necked pistol cartridges such as the larger-caliber .357 SIG, the .22 TCM trades bullet mass for increased velocity and lowered recoil.[1]

Based on the 5.56×45mm NATO case and shortened so that the shoulder is at approximately the same length as a .38 Super cartridge, the .22 TCM is somewhat longer than the ubiquitous 9×19mm Parabellum and designed to be fired from a RIA line of weapons (which also included 9mm barrel swaps) fed by Para-Ordnance-style double-column .38 Super magazines. A sub-variant, the 22 TCM 9R, with a shorter, more deeply-seated bullet, is designed for use in Glock magazines limited to standard-length 9mm cartridges. Standard factory loads are 40-grain jacketed soft hollow point, 39-grain for "9R".

The .22 TCM 9R (right) uses a shorter bullet than the regular round (left).

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References[edit]