In addition, the case’s two-piece construction gives it slightly more internal volume than traditional brass 9mm cases. This prevents gas leaks and also helps keep cartridge backpressure on the breech face from reaching levels that would damage the pistol. Evidently, the case does not snap back until the projectile has left the bore. The steel cylinders of the Shell Shock cases also expand, but they snap back quickly and remain close to their original size. When fired, cases made of brass expand to fill the chamber to prevent gas leaks, and they generally keep their expanded shape long after the bullet has left the barrel. Cars – Busting Myths of Using Vehicles for Cover (VIDEO)īecause of their rather unique design and materials, the Shell Shock cases work differently than conventional solid-brass cases. Because of this and the fact that the case walls are steel, the Shell Shock 9mm case is claimed to be able to tolerate pressures up to 70,000 psi, which provides a wide margin of safety given that the SAAMI maximum average for a +P 9mm is 38,500 psi. It has a cylindrical steel body and an aluminum head, which are held together by a compression joint that becomes stronger as the pressure increases, forcing the two pieces of the case together. On the other hand, the NAS 3 case is designed for high pressure. Most of the two-piece designs, including shotshells, were originally designed for low-pressure blackpowder cartridges. Today, almost all shotgun shells are of two-piece construction. 442 blackpowder revolver cartridge made for the Tranter revolver in England during the late 1860s. The earliest two-piece case I could find was the. The concept of a two-piece cartridge case isn’t new. The steel is a high-tensile nickel-steel alloy, and the aluminum is an aircraft-quality alloy with electroless nickel plating. Other cases use steel or aluminum, but the Shell Shock case is not made of just any steel and aluminum. Shell Shock’s NAS 3 case is a two-piece design that is made of steel and aluminum. NAS3 Design NAS3 cases are held together with strong compression joints. There have been recent experiments with using polymer to replace brass, but up until the recent appearance of the NAS 3 9mm shell case from Shell Shock Technologies of Westport, Connecticut, there was no real alternative to the one-piece brass, aluminum and steel centerfire rifle and pistol cases we’ve all used for years. But it’s been decades since the introduction of aluminum and steel cartridge cases. We’re constantly being introduced to new cartridges, bullets, powders and even primers. Ammunition is probably the fastest-changing portion of the shooting sports industry.
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