4 bore
Black powder hunting caliber / From Wikipedia, the free encyclopedia
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Four bore or 4 bore is a black powder caliber of the 19th century, used for the hunting of large and potentially dangerous game animals. The specifications place this caliber between the larger 2 bore and the smaller 6 bore rifles. This caliber was the quintessential elephant gun caliber of the black powder safari rifles.[1] The caliber was also used for the Coffman cartridges used for starting large aero engines such as the Rolls-Royce Griffon as used in the later Marks of Supermarine Spitfire.[2]
Quick Facts Type, Place of origin ...
4 bore | ||||||||||||
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Type | Rifle or Smoothbore, Heavy Game | |||||||||||
Place of origin | British Empire | |||||||||||
Specifications | ||||||||||||
Case type | Rimmed, straight | |||||||||||
Bullet diameter | 1 inch (25.4 mm) | |||||||||||
Neck diameter | 1.07 inch (27.15 mm) | |||||||||||
Base diameter | 1.1 inch (28 mm) | |||||||||||
Rim diameter | 1.23 inch (31.3 mm) | |||||||||||
Rim thickness | .06 inch (1.5 mm) | |||||||||||
Case length | 4 inches (101.5mm) | |||||||||||
Overall length | 4.7 inches (119.3 mm ) | |||||||||||
Maximum pressure | 36,259 psi (2,500 bar) | |||||||||||
Ballistic performance | ||||||||||||
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