Abstract: The invention relates to systems, methods and devices for controlling the dispersion of shot or other projectiles fired from a weapon such as a shotgun. Embodiments according to the invention employ an inner cylindrical chamber that is divided at a median transverse plane into forward and rear sections. The rear section of the chamber tapers toward the median transverse plane and includes a number of radial vents that open into an outer chamber that provides one or more gas bypass channels into the forward section of the tubular chamber. Alternatively, channels function as unitary vents and outer chamber to provide for a gas bypass. The forward section tapers toward a forward muzzle opening. When a multiple projectile load/wad is fired from the weapon, expanding gas is sealed behind the load until it has advanced past the radial vents at which point, gas is allowed to expand into the outer chamber resulting in a momentary pressure drop and reduced propulsion force behind the wad/load.

Abstract: The invention relates to systems, methods and devices for controlling the dispersion of shot or other projectiles fired from a weapon such as a shotgun. Embodiments according to the invention employ an inner cylindrical chamber that is divided at a median transverse plane into forward and rear sections. The rear section of the chamber tapers toward the median transverse plane and includes a number of radial vents that open into an outer chamber that provides one or more gas bypass channels into the forward section of the tubular chamber. The forward section tapers toward a forward muzzle opening. When a multiple projectile load/wad is fired from the weapon, expanding gas is sealed behind the load until it has advanced past the radial vents at which point, gas is allowed to expand into the outer chamber resulting in a momentary pressure drop and reduced propulsion force behind the wad/load.

Abstract: An improved shotgun choke tube or fixed shotgun shot choking system is provided in which the 3-dimensional tightness or compactness of the pattern is achieved by the placement of radial projections within the choke tube at a selected distance from the muzzle, dependent upon the length of the shotgun shell being used, in conjunction with varying the dimensions of the projections depending on the nature of the components used in the manufacture of the particular shotgun shell used and the pattern results desired. Widest patterns (which are narrower or tighter than without the use of the choke tube) are achieved when the projections are positioned adjacent to the muzzle and/or with radial projections of minimal area contacting the walls of the wad/cup to retard its exit from the muzzle.