4mm M20 for indoor shooting
5 mm Remington Rimfire Magnum Designed in 1969 never popular, discontinued in 1973
.22 Winchester Rimfire .22 WRF introduced in 1890 identical to .22 Remington Special (has a roundnosed slug)
.22 WMR .22 magnum .22 Mag Introduced in 1959 by Winchester 40 grains (2.6 g) bullet The only successful rimfire
.22 extra long Introduced early 1880's 40 gr (2.6 g) lubricated bullet .22 long rifle combined the case of the
.17 Mach 2 .17 HM2 introduced in 2004 .22 Long Rifle case, necked down to .17 caliber (4.5 mm) 17
.17 HMR .17 Hornady Magnum Rimfire Developed by Hornady in 2002 .22 Magnum necked down to .17 caliber (4.5 mm)
.22 long rifle .22 LR Developed by Stevens Arms in 1887 combines the case of the ".22 Long" with the
.22 CB .22 CB Cap (Conical Ball Cap) 6mm Flobert Introduced in 1888 20 to 29 grains (1.30 to 1.88
.22 long Introduced in 1871 .22 Long is the 2nd oldest (still used) rimfire cartridges 29 grain (1.9 g) bullet
.22 short Developed in 1857 for the first Smith & Wesson revolver First American metallic cartridge 29 grain (1.88 g)
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