Practically there can be some muzzle velocity gained by this method, but the measured results between parent cartridges and their "improved" wildcat offspring is often marginal. 408 CheyTac factory cases the wildcatter generally hopes to gain extra muzzle velocity by increasing the case capacity of the factory parent cartridge case by a few percent.
408 CheyTac serves as the parent for several other second-generation wildcat cartridges.īy blowing out. regulated countries are currently (2016) proof tested at 550.00 MPa (79,771 psi) PE piezo pressure. 408 Cheyenne Tactical chambered arms in C.I.P. pressure to certify for sale to consumers. regulated countries every rifle cartridge combo has to be proofed at 125% of this maximum C.I.P. 408 Cheyenne Tactical can handle up to 440.00 MPa (63,817 psi) P max piezo pressure. (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) rulings the. The common rifling twist rate for this cartridge is 330.2 mm (1 in 13 in), 8 grooves, Ø lands = 10.16 mm (0.400 in), Ø grooves = 10.36 mm (0.408 in), land width = 2.57 mm (0.1 in) and the primer type is large rifle.Īccording to the official C.I.P. All sizes in millimeters (mm).Īmericans would define the shoulder angle at alpha/2 ≈ 22.13 degrees. 408 Cheyenne Tactical has 10.32 ml (159 grains H 2O) cartridge case capacity. In 2020 it was deregistered by the C.I.P. 408 Cheyenne Tactical became officially registered by the Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives (C.I.P.) on ending its status as a wildcat cartridge. This method results in a very pressure resistant case. They created a hardness distribution ranging from the head and web (hard) to the mouth (soft) as well as a strengthened (thicker) case web and sidewall immediately forward of the web. In modern solidhead cases, the hardness of the brass is the major factor that determines a case's pressure limit before undergoing plastic deformation. 408 CheyTac cartridge casing design particular attention was directed toward thickening and metallurgically strengthening the case's web and sidewall immediately forward to the web to accommodate high chamber pressures. When the sidewall resists the outward expansion against the chamber, the pressure stretches the case thereby increasing its length resulting in the sidewall becoming thinner at that stretch point. The case is driven back against the bolt face which results in the stretching of the case, particularly the sidewall immediately forward of the web. During ignition, the cartridge's base, forward to the bolt face, is not supported. One of the disadvantages to these old cartridge cases intended for firing cordite charges instead of modern smokeless powder is the thickness of the sidewall just forward to the web. 505 Gibbs is an old English big game cartridge that was designed to accommodate 39,160 psi (270 MPa) pressure. 400 Taylor Magnum, which itself is based on a modified. It is offered as a competitor to the most common military NATO long-range service cartridges such as. The round was designed with a possible military need for a cartridge for anti-personnel, anti-sniper, and anti-materiel roles with a (supersonic) precision range of 2,200 yards (2,000 m). from 2013 to 2021) is a specialized rimless, bottlenecked, centerfire cartridge for military long-range sniper rifles that was developed by Dr.
408 Cheyenne Tactical (designated 408 Chey Tac (10.36×77mm) by the C.I.P.
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