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The .25 ACP was designed because .25-caliber was the smallest John Browning could go while still retaining a centerfire primer pocket, which would be more reliable for self-defense than rimfire primers.
B shot is 0.170 in (4.3 mm), and sizes go up in 0.01 in (0.25 mm) increments for BB and BBB sizes. In metric measurement, #5 shot is 3 mm; each number up or down represents a 0.25 mm change in diameter, so e.g. #7 shot is 2.5 mm.
The .25 Remington (also known as the .25 Remington Auto-Loading) is an American rifle cartridge.A rimless, smokeless powder design, this cartridge was considered to be very accurate by period firearm experts and suitable for game up to deer and black bear. [1]
A 12-gauge shotgun, nominally 18.5 mm (0.73 in), can range from a tight 18 mm (0.71 in) to an extreme overbore of 20 mm (0.79 in). Some also claim an increased velocity with the overbored barrels, up to 15 m/s (49 ft/s), which is due to the larger swept volume of the overbored barrel.
The Daisy V/L rifle uses a .22 caliber (5.5 mm) low-powered external-propellant caseless round with no primer. The rifle was basically a spring-piston air rifle, but when used with the V/L ammunition the energy from the compression of the piston heated the air behind the caseless cartridge enough to ignite the propellant, and this generated the ...
The .25-06 Remington was a wildcat cartridge for nearly half a century before being standardized by Remington in 1969.. Its design was based on the .30-06 Springfield cartridge necked-down (case opening made narrower) to .257 caliber keeping a similar cartridge length of its parent case, thus being chambered in standard-length actions.
The 5 mm Remington Rimfire Magnum or 5 mm RFM [2] is a bottlenecked rimfire cartridge introduced by Remington Arms Company in 1969. Remington chambered it in a pair of bolt-action rifles, the Model 591 and Model 592 , but this ammunition never became very popular, and the rifles were discontinued in 1974. [ 3 ]
The specified maximum diameter of an unfired .50 BMG bullet is 0.510-inch (13.0 mm); while this appears to be over the .50 inch (12.7 mm) maximum allowed for non-sporting Title I firearms under the U.S. National Firearms Act, the barrel of a .50 BMG rifle is only .50 inch (12.7 mm) across the rifling lands and slightly larger in the grooves ...