at , giving the same overall length as the long rifle cartridge. This longer case can cause ejection problems in some guns. A powder with a slower burning rate is used to make the most use of the length of a rifle barrel. Most .22 long rifle powders increase velocity up to about of barrel. The powder used in the Stinger increases velocity up to the longest .22 barrel length tested by the NRA, . Later hyper-velocity rounds were introduced by other makers, based on the long rifle case with lighter bullets in the 30-gr weight range and slow-burning rifle powder loadings. The overall length of many of these cartridges was less than the overall length of the standard 40-gr bullet long rifle cartridge. One example is the Remington Viper; another is the Federal Spitfire. The CCI Velocitor hyper-velocity round uses the standard long rifle case size and a standard weight bullet of proprietary hollow-point design to augment expansion and trauma. This cartridge has a muzzle velocity of and matches the overall length of the standard long rifle cartridge. Shot cartridges Special .22 LR caliber shot cartridges, usually loaded with No. 12 shot, have also been made. These are often called "snake shot," "bird shot" and "rat-shot" due to their use in very short range pest control. Such rounds have either a longer brass case that is crimped closed, or a translucent plastic "bullet" that contains the shot and shatters upon firing. In specially made .22-bore shotguns, the shot shells can be used for short-range skeet shooting and trap shooting at special, scaled-down, clay targets. Full metal jacket During World War II, a full metal jacket bullet version of the .22 LR was developed as the T-42 for the suppressed High Standard HDM pistol. The US Army Air Corps procured the Savage Model 24 .22 LR/.410 combination gun as an air crew survival weapon included in the E series of survival and sustenance kits, primarily to forage for game for food. The .22 LR full metal jacket bullet ammunition was issued with these firearms for military use to comply with treaty restrictions on expanding bullets. The 1961 Army/Air Force Technical Manual/Order on ammunition lists three types of rimfire CARTRIDGE, CALIBER .22: Ball, Long Rifle: Long Rifle (Lead Bullet), propellant: 1.7 gr smokeless, bullet: 40 gr, overall length: . Long Rifle (Commercial), propellant: 2.1 gr smokeless, bullet: 40 gr, overall length: