quelques pas de rayures /standard

Le 1 veut dire 1 tour et le chiffre ensuite donne le pas de rayure :
22 Short = 1 in 24"
.22 Long Rifle = 1 in 16"
.223 Remington = 1 in 12"
.22-250 Remington = 1 in 14"
.243 Winchester = 1 in 10"
6mm Remington = 1 in 9"
.25-06 Remington = 1 in 10"
.257 Wby. Mag. = 1 in 10"
6.5x54 M-S = 1 in 7.9"
6.5x55 Swedish Mauser = 1 in 7.5"
.260 Remington = 1 in 9"
.270 Winchester = 1 in 10"
.270 WSM = 1 in 10"
7mm-08 Remington = 1 in 9.25"
7mm Rem. SAUM = 1 in 9.25"
7mm Rem. Mag. = 1 in 9.25"
.30 Carbine = 1 in 16"
.30-30 Winchester = 1 in 12"
.308 Winchester = 1 in 12"
.30-06 Springfield = 1 in 10"
.300 WSM = 1 in 10"
.300 Win. Mag. = 1 in 10"
.300 Wby. Mag. = 1 in 10"
.303 British = 1 in 10"
.32 Win. Spec. = 1 in 16"
.338-57 O'Connor = 1 in 10"
.338 Win. Mag. = 1 in 10"
.35 Remington = 1 in 16"
.350 Rem. Mag. = 1 in 16"
.375 H&H Mag. = 1 in 12"
.416 Rem. Mag. = 1 in 14"
.444 Marlin = 1 in 38"
.45-70 Govt. (Marlin and Ruger rifles) = 1 in 20"
.450 Marlin = 1 in 20"
.458 Win. Mag. = 1 in 14"
Bien sur c'est là quelques exemples de pas standard, un canon peut toujours être fabriqué sur demande pour un calibre donné avec un pas rayure plus rapide afin de stabiliser des ogives plus lourde.
                                                                                               LONGRIFLE

Que des calibres américains of course!
Mais intéressant none the less.