![]() ![]() This large empty volume inhibits proper propellant burn, results in inconsistent propellant positioning, shows reduced accuracy and, in special situations, may lead to extremely high propellant burn rates or even propellant detonation, an extremely dangerous situation for the weapon user. The problem with this approach is that reducing the propellant charge leaves a relatively large empty volume inside the case, in which the vacated propellant charge used to be stored. The traditional route to manufacturing subsonic rounds has been to simply reduce the propellant charge in a conventional supersonic round until the velocity is adequately reduced. Therefore, the cartridge base end must possess the greatest mechanical strength, while a gradual decrease in material strength is acceptable in metal cartridges axially along the casing toward the projectile end (3). During firing, a stress profile is developed along the cartridge casing, with the greatest stresses being concentrated at the base end (7). During firing, a weapon's cartridge chamber supports the majority of the cartridge casing wall (6) in the radial direction, but, in many weapons, a portion of the cartridge base end (7) near the primer end (2) is unsupported. ![]() As shown, the conventional cartridge casing article (1 ) is a one- component deep-drawn item defining an inner volume (V), the casing article having a primer end (2) and a projectile end (3) and can be divided into a neck portion (4) and a body portion (5). 1 shows a cross-sectional view of a conventional brass, steel or aluminum ammunition article, namely a cartridge casing, used for supersonic and subsonic ammunition. Subsonic propellant volume within said conventional supersonic ammunition article and controllably introducing a filler material therearound is also provided. In still other embodiments a method for converting a conventional supersonic ammunition article to a subsonic ammunition article including defining a new In other embodiments such subsonic ammunition article manufacturing apparatus includes a core pin configured to removably mate within the inner volume of a conventional supersonic ammunition casing to provide an inner volume boundary around which the filler material defines a new subsonic propellant volume within the inner volume of the conventional supersonic ammunition article. In many embodiments such subsonic ammunition article manufacturing apparatus includes at least a filler material introducing apparatus, which may in some embodiments include sprues, runners and gates. In embodiments, the apparatus include devices for controllably introducing a filler material to reduce the inner volume of a conventional supersonic ammunition article. Turning now to the drawings, apparatus and methods for manufacturing subsonic ammunition articles from conventional supersonic ammunition articles are illustrated.
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