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The magnitude of such precision (152 decimal places) can be put into context by the fact that the circumference of the largest known object, the observable universe, can be calculated from its diameter (93 billion light-years) to a precision of less than one Planck length (at 1.6162 × 10 −35 meters, the shortest unit of length expected to be ...
With a rimless, bottlenecked case using smokeless powder, the 7.65×25mm Borchardt adapted features of the 7.92 mm cartridge used in the 1888 pattern M/88 rifle, essentially scaling it down for use in a pistol.
European 7 mm cartridges all have 7.24 mm (0.285 in) grooves diameter. American 7 mm cartridges have 7.21 mm (0.284 in) grooves diameter. According to the official C.I.P. (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) rulings the 7×57mm case can handle up to 390.00 MPa (56,565 psi) P max piezo pressure.
The common rifling twist rate for this cartridge is 240 mm (1 in 9.45 in), four grooves, diameter of lands = 7.62 mm (0.300 in), diameter of grooves = 7.92 mm ...
The M/88 bore originally had 7.90 mm (0.311 in) lands diameter and 8.10 mm (0.319 in) grooves diameter. The M/88 barrel bore specification was changed by 1894–1895 to 7.90 mm (0.311 in) lands diameter and 8.20 mm (0.323 in) grooves diameter to improve accuracy and reduce barrel wear in M/88 chambered arms.
In speed skating, for short track, the official Olympic rink size is 30 m × 60 m (98 ft × 197 ft), with an oval ice track of 111.12 m (364.6 ft) in circumference. In long track speed skating the oval ice track is usually 400 m (1,300 ft) in circumference.
The 7.63×25mm Mauser (.30 Mauser Automatic) round is a bottleneck, rimless, centerfire cartridge, originally developed for the Mauser C96 service pistol. This cartridge headspaces on the shoulder of the case. [1]
Name Bullet Case length Rim Base Shoulder Neck OAL .270 British: 7.04 mm (0.277 in) 46 mm (1.8 in) 11.3 mm (0.44 in) 11.3 mm (0.44 in) - - 62.3 (2.45)