Colt firearm dating

For example, the .50-90 Sharps is a .50 caliber bullet (.512) with a nominal charge of 90 grains (5.8 g) of black powder with a case length of 2.50 inches (64 mm).

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After the projectile leaves the barrel the pressure drops, allowing the cartridge case to contract slightly easing its removal from the chamber.

Automatic and semiautomatic firearms, which extract and eject the case automatically as a part of their operating cycle, sometimes damage the case in the process of ejection.

For example, the 7.62×51mm NATO uses a bore diameter of 7.62 mm and has an overall case length of 51 mm.

In the case of old black powder cartridges, the second number typically refers to the powder charge.

This is incorrect; "bullet" refers specifically to the projectile itself, not the entire cartridge.

The cartridge case seals a firing chamber in all directions except down the bore. A jet of burning gas from the primer ignites the powder.The length of a cartridge case may also be designated in millimeters.The stated caliber of any given ammunition or firearm may not necessarily correlate to the exact dimensions.The .38 Special actually has a bullet diameter of 0.357 inches (9.1 mm) (jacketed) or 0.358 inches (9.1 mm) (lead) while the case has a nominal diameter of 0.380 inches (9.7 mm) to allow the projectile to fit within a case with a wall thickness of half of the 23/1000 of an inch difference.The .357 Magnum is a direct evolution of the .38 Special, but differently named, and no reference is made to the longer case except by the name 'Magnum'.Most high-powered firearms have relatively small projectiles moving at high speeds.

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