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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 ...
The primers for the cartridges were non-corrosive because the M1 carbine's gas-system would have fouled or corroded if standard corrosive primers were used. It only came in Grade R ("Rifle") because the M1 Carbine was semi-automatic only, dispensing with the use for Grade 2 for an automatic weapon.
The .303/25, sometimes known as the .25/303 is a wildcat centrefire rifle cartridge, based on the .303 British, necked down to fire a .257 projectile, originating in Australia in the 1940s as a cartridge for sporterised rifles, particularly on the Lee–Enfield action; similar versions also appeared in Canada around the same time.
The original .303 British service cartridge employed black powder as a propellant, and was adopted for the Lee–Metford rifle, which had rifling designed to lessen fouling from this propellant, which replaced the Martini-Henry rifle in 1888. Some Martini-Henrys were rebarrelled to use the new .303 as the "Martini–Metford".
Tubes and primers are used to ignite the propellant in projectile weapons. In ancient times various devices were adopted to ignite the charge . Small guns were fired by priming powder poured down the touch hole (or vent) and ignited by glowing embers or a red-hot iron rod.
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In the wet state, the primer is stable; a pellet of wet primer is placed in the shell and simply spun around to cover the full extremes of the rim. (For more on the exact process and one set of chemical compounds that have been used successfully, see U.S. patent 1,880,235 , a 1932 Remington Arms patent by James E. Burns.)
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