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This is a list of firearm cartridges which have bullets in the 7.00 to 7.99 millimetres (0.2756 to 0.3146 in) caliber range. Length refers to the cartridge case length. OAL refers to the overall length of the cartridge.
All sizes in millimeters (mm). [7] Americans would define the shoulder angle at alpha/2 = 25 degrees. The common rifling twist rate for this cartridge is 241 mm (1 in 9.49 in), 6 grooves, Ø lands = 7.04 mm, Ø grooves = 7.21 mm
5.56×45mm NATO – standard ammunition size; 6 mm – approximate width of a pencil; 7 mm – length of a Paedophryne amauensis, the smallest-known vertebrate [108] 7.1 mm – length of a sunflower seed; 7.62×51mm NATO – common military ammunition size [109] 8 mm – width of old-format home movie film
.284 in (7.2 mm) Neck diameter.317 in (8.1 mm) Shoulder diameter.5250 in (13.34 mm) Base diameter.5500 in (13.97 mm) Rim diameter.532 in (13.5 mm) Case length: 2.850 in (72.4 mm) Overall length: 3.600 in (91.4 mm) Case capacity: 108.1 gr H 2 O (7.00 cm 3) Rifling twist: 1-9 1/4" Primer type: Large rifle magnum: Ballistic performance
The .308 Winchester is measured across the grooves and uses a .308-in diameter (7.82-mm) bullet; the military-specification version is known as 7.62 × 51 mm NATO, so called because the bore diameter measured between the lands is 7.62 mm, and the cartridge has a case 51 mm long.
In some ways, the 6.8×51 cartridge is actually closer to a true designation of "7mm-08" than the Remington cartridge, as the actual bullet diameter of the 6.8×51 common cartridge is 7.04 mm, whereas the 7mm-08 Remington bullet diameter is a slightly larger 7.21 mm. [32]
Works with 15 mm miniatures where a 6 foot man would equal 15.24 mm 1:110: 2.771 mm Used for some model ships, aircraft and diecast cars. 1:108: 2.822 mm An historic size for ships, also used for rockets and spacecraft. 15 mm figure scale for wargaming is considered interchangeable with this scale. [9] 1:100: 3.048 mm
Metric size American system Continental system Chinese system American [4] British [1] French [5] German [6] Dutch ... 12.7 mm: Double Great Primer Trismégiste: Kanon