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The .22 Remington Automatic / 5.7x23mmRF (also known as the .22 Remington Auto and occasionally .22 Rem Auto) is a .22in (5.6mm) American rimfire rifle cartridge. Introduced for the Remington Model 16 semiautomatic rifle in 1916, [ 2 ] the .22 Rem Auto was never used in any other firearm. [ 3 ]
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Using the same 40 gr (2.6 g) outside-lubricated bullet later adapted for the much more common .22 long rifle, [2] the extra long was loaded with 6 gr (389 mg) of black powder. [2] Originally, it slightly outperformed the .22 LR, but was "not noted for great accuracy", [2] while later smokeless loads achieved about the same muzzle velocity as ...
.22 caliber, or 5.6 mm, refers to a common firearms bore diameter of 0.22 inch (5.6 mm) in both rimfire and centerfire cartridges. Cartridges in this caliber include the very widely used .22 Long Rifle and .223 Remington/5.56×45mm NATO. .22 inch is also a popular air gun pellet caliber, second only to the ubiquitous .177 caliber.
The most common rimfire cartridges are chambered for .17 caliber and .22 caliber. The bullet diameter for .17 caliber firearms generally measure .172 inch (4.37 mm), while the bullet diameter for .22 caliber firearms generally measure .222 inch (5.64 mm).
The CCI Stinger was the first hyper-velocity .22 LR cartridge and provided a significant increase in velocity and energy over standard rimfire rounds. The Stinger case is slightly longer at .702 in (17.8 mm) versus .613 in (15.6 mm) for the long rifle case, but the plated hollow point bullet is lighter and shorter at 32 gr (2.1 g), giving the ...
These new "High Velocity" loadings offered a nearly 300 ft/s (91 m/s) increase in velocity over the original 1,050 ft/s (320 m/s) .22 LR load. [citation needed] This increase in power of the smaller round, coupled with its cheaper price and sheer number of rifles already owned in .22 LR, effectively killed the .22 WRF. [citation needed]
This ammunition does not meet the FBI Ammunition Testing Protocol. With a 3.75-inch test barrel, HST 380 Auto Micro ammunition achieves a muzzle velocity of 1,030 feet per second, a velocity of 990 feet per second at 25 yards, and a velocity of 950 feet per second at 50 yards.