50BMG sniper rifle - Say hello to the 20mm BTW

SPECIFICATIONS
20-mm version
Cartridge: 20x83.5 mm MG151.
Operation: manual bolt action.
Feed: 3-round box-type, detachable magazine.
Weight, empty, kg: 26.
Overall length, mm: 1,795
Rifling: 1 full turn in 560 mm.
Length of barrel, mm: 1,000
Muzzle velocity, m/sec: 720
Muzzle energy, J: 28,500
Effective range, m: > 1,500

14.5-mm version
Cartridge: 14.5x114 mm Russian.
Operation: manual bolt action.
Feed: 3-round box-type, detachable magazine.
Weight, empty, kg: 29.
Overall length, mm: 2,015
Rifling: 1 full turn in 406 mm.
Length of barrel, mm: 1,220
Muzzle velocity, m/sec: 1,080
Muzzle energy, J: 30,675
Effective range, m: > 2,300