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The effective length of the barrel (from breech to muzzle) is divided by the barrel diameter to give a dimensionless quantity. [2]: 81 For example, the main guns of the Iowa-class battleships can be referred to as 16"/50 caliber. They are 16 inches in diameter and the barrel is 800 inches long (16 × 50 = 800).
The standard AP-9 has a 5-inch barrel. The AP-9 Target began with a 12-inch barrel (Target AP-9), but this was later reduced to 11 inches (AP-9/11 Target); they both have a separate fore-end and a fluted barrel. These firearms were banned by most states after the passage of the Federal Assault Weapons Ban. [2] [3]
In the classic division a choice can be made between up to a 10-shot capacity 1911 with minor scoring (e.g. 9×19mm) or up to an eight-shot capacity 1911 with major scoring (e.g. .40 S&W or .45 ACP). In the revolver division major scoring can be achieved with a 9 mm bullet diameter, but with a power factor of 170.
For handgun cartridges, with heavy bullets and light powder charges (a 9×19mm, for example, might use 5 grains (320 mg) of powder, and a 115 grains (7.5 g) bullet), the powder recoil is not a significant force; for a rifle cartridge (a .22-250 Remington, using 40 grains (2.6 g) of powder and a 40 grains (2.6 g) bullet), the powder can be the ...
Illustration of forces in muzzle rise. Projectile and propellant gases act on barrel along barrel centerline A. Forces are resisted by shooter contact with gun at grips and stock B. Height difference between barrel centerline and average point of contact is height C. Forces A and B operating over moment arm / height C create torque or moment D, which rotates the firearm's muzzle up as ...
Once all the cartridges had been tested at 18" and the barrels were cut and ready, each brand was tested again at 17" and so on, right down to a 2" barrel. Three rounds of each brand of ammunition were fired at each barrel length and the velocity of the bullet was recorded as it passed over two commercial chronographs 15 feet away.
In 2007, Ruger discontinued production of their original police carbine, citing low demand. More than ten years later on December 29, 2017, Ruger announced the reintroduction of a new upgraded 9 mm takedown model called the Ruger PC carbine with the PC now referencing the old police carbine name and the product descriptions calling them pistol-caliber carbines, which has a 16.12-inch (409 mm ...
All guns employed a Welin breech block and used a Smith-Asbury mechanism, and, in the case of the Mark 12, chromium plating was introduced to prolong barrel life. These improvements enabled the guns to fire heavier 1,500 lb (680 kg) shells, and increasing the gun mount elevation to 30 degrees [ 2 ] extended the range of the guns to 36,000 yd ...