.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 ammo

The .17 HM2 was never successful

.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