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It was originally named the MMJ 5.7mm [1] by its designer and is also known in the U.S. as the 5.7mm Johnson, the Johnson MMJ 5.7mm Spitfire, and the .22 Johnson, (or 5.7×33mm internationally). In 1963, Melvin M. Johnson developed a conversion of the M1 Carbine (by either relining or re-barreling the M1 Carbine ) to a .224 caliber bore, using ...
Drawings of various types of semiwadcutter bullets 4-cavity Keith semiwadcutter bullet mold, the Lyman 358429. The semiwadcutter design consists of a roughly conical shape with the tip truncated flat (called a meplat), sitting on a cylinder (A at right). The base of the cone is slightly smaller in diameter than the cylinder, leaving a sharp ...
It had a six-shot, rotating cylinder, and fired a 0.454-inch-diameter (11.5 mm) round spherical lead ball, or a conical-tipped bullet, typically propelled by a 30-grain charge of black powder, which was ignited by a small copper percussion cap that contained a volatile charge of fulminate of mercury (a substance that explodes upon being ...
Components of a modern bottleneck rifle cartridge. Top-to-bottom: Copper-jacketed bullet, smokeless powder granules, rimless brass case, Boxer primer.. Handloading, or reloading, is the practice of making firearm cartridges by manually assembling the individual components (metallic/polymer case, primer, propellant and projectile), rather than purchasing mass-assembled, factory-loaded ...
HBWC rounds are best used at only the lowest velocities, as by being hollow at the rear end, they can split under heavy loads. DEWC rounds are best suited for automatic press reloading uses, as they may be used when loaded with either end pointed forward. BBWC have been developed to permit easier bullet insertion into the case when reloading.
The Enfield Pattern 1853 rifle-musket (also known as the Pattern 1853 Enfield, P53 Enfield, and Enfield rifle-musket) was a .577 calibre Minié-type muzzle-loading rifled musket, used by the British Empire from 1853 to 1867; after which many were replaced in service by the cartridge-loaded Snider–Enfield rifle.
The .375 Ruger cartridge case was used by Hornady as the basis for a new extra long range cartridge since it had the capability to operate with high chamber pressures which, combined with a neck and barrel throat optimized for loading relatively long and heavy .308 diameter very-low-drag bullets without the need to seat the bullets deeply ...
As was Johnson's practice, he gave all of his weapons a "pet" nickname. Johnson christened his semi-automatic rifle Betsy and the Light Machine Gun Emma. Melvin Johnson continued to develop small arms. He worked with ArmaLite and Colt's Manufacturing Company as an advocate for the AR-15. The AR-15 used a similar bolt design to the M1941 Johnson ...