Firearm barrels and projectiles

Details Firearm barrels and projectiles Firearm barrels and projectiles

1974-02-20

1979-12-04

Jordan, Charles T.

Firearms

Barrels

42 78, 89 14D, 102 92, 102 922, 102 93, 244 323, F41C 2100, F41F 1710, F42B 1100

Patent

active

041764870

ABSTRACT:
A firearm barrel is provided with a smooth bore which is widened in areas with annular grooves or pockets in the bore walls which act as propellant gas pressure relief areas. When a projectile is fired through the smooth bore, helical notches in the rear of the projectile cooperate with the gas-relief areas of the bore to allow propellant gas to flow and be expanded through the rear helicals, imparting a twist to the projectile, as the cylindric calibre proper of the projectile fills and seals the forward area of the bore proper past the widened bore areas, therefore gas is prevented from escaping past the projectile's forward end and the full volume of the gas is retained to propel the projectile forward until it has left the muzzle of the firearm barrel.

REFERENCES:
patent: 1450558 (1923-04-01), Maze
patent: 2742821 (1956-04-01), Sweetman
patent: 3059367 (1962-10-01), Rosebush
patent: 3483794 (1969-12-01), Packard

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