Rimfire
.22 WRF
.22 Winchester Rimfire .22 WRF introduced in 1890 identical to .22 Remington Special (has a roundnosed slug)
.22 mag
.22 WMR .22 magnum .22 Mag Introduced in 1959 by Winchester 40 grains (2.6 g) bullet The only successful rimfire cartridge introduced in the 20th Century
.22 extra long
.22 extra long Introduced early 1880’s 40 gr (2.6 g) lubricated bullet .22 long rifle combined the case of the “.22 Long” with the 40-grain (2.6 g) bullet of the “.22 Extra Long” .22 Short, .22 Long, .22 LR can all shoot from .22 extra long Stopped being available commercially in 1935
.17 Mach 2
.17 Mach 2 .17 HM2 introduced in 2004 .22 Long Rifle case, necked down to .17 caliber (4.5 mm) 17 grains Bullet weighs less than half the typical .22 Long Rifle bullet .17 caliber bullet is much more difficult to manufacture than .22 LR .17 Mach 2 typically cost twice as much .22 Long Rifle … Read more
.17 HMR
.17 HMR .17 Hornady Magnum Rimfire Developed by Hornady in 2002 .22 Magnum necked down to .17 caliber (4.5 mm) bullet 17 grain (1.1 g) bullet exceptionally flat trajectory, Longer range than .22 mag
.22 long rifle
.22 long rifle .22 LR Developed by Stevens Arms in 1887 combines the case of the “.22 Long” with the 40-grain (2.6 g) bullet of the “.22 Extra Long” .22 LR most common caliber in the world Ideal for: recreational shooting training, small-game hunting pest control
.22 CB
.22 CB .22 CB Cap (Conical Ball Cap) 6mm Flobert Introduced in 1888 20 to 29 grains (1.30 to 1.88 g) Bullet usually just the primer, no gunpowder
.22 long
.22 long Introduced in 1871 .22 Long is the 2nd oldest (still used) rimfire cartridges 29 grain (1.9 g) bullet In 1887 the .22 Long was combined with the .22 Extra Long to make the .22 Long Rifle
.22 short
.22 short Developed in 1857 for the first Smith & Wesson revolver First American metallic cartridge 29 grain (1.88 g) bullet or 30 grain (1.94 g) bullet Designated the “.22 Short” in 1871 when the .22 Long cartridge was introduced