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Every firearm leaves unique, reproducible markings on expended (used) bullet and cartridge cases that it fired. The barrel, firing pin, firing chamber, extractor, ejector and other parts of the gun leave these marks, called toolmarks, on the bullet and cartridge case faces. Individually and collectively, these markings function as the ...
Spent cartridges found at a scene can be examined for physical evidence such as fingerprints or compared to samples that match them to a weapon. The examination of the cartridge relies on the unique tool marks left by the various parts of the weapon including the firing pin and the ejector in semi and fully automatic firearms. These markings ...
A flip-up barrel and lack of extractor on a Beretta Bobcat semi-automatic pistol. Some very early blowback pistols used ammunition with no rim or extractor groove on the cartridge cases (e.g., 5mm Bergmann), and such pistols, therefore, lacked extractors. The spent case was forced out of the chamber by recoil and was subsequently ejected.
Magnum-action cartridges, are usually rifle cartridges that are both longer and more powerful than traditional full-powered rifle long-action cartridges, with a COL between 85 and 91 mm (3.34 and 3.6 in), including some of the long-action cartridges with a case head larger than 13 mm (.50 in) diameter, which is most commonly exemplified by the ...
The belt was carried through on other cartridges derived from the .375 Velopex, like the belted .375 Holland & Holland Magnum of 1912, in some cases to allow the cartridge to function in bolt-action rifles (the original .375 H&H Magnum was a rimmed case for use in double-barreled rifles), or to prevent the higher-pressure magnum cartridge from ...
Rim lock is where the rim of the shell casing gets caught on the extractor groove of the casing underneath it. It is a common issue for calibers with large rims, such as 7.62×54mmR, or guns that have been rechambered for cartridges shorter than intended without replacing the original magazine with one that compensates for the shorter round.
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Centerfire: A cartridge in which the primer is located in the center of the cartridge case head. Unlike rimfire cartridges, the primer is a separate and replaceable component. The centerfire cartridge has replaced the rimfire in all but the smallest cartridge sizes. Except for low-powered .22 and .17 caliber cartridges, and a handful of ...