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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 head of a brass case can be work-hardened to withstand the high pressures, and allow for manipulation via extraction and ejection without rupturing. The neck and body portion of a brass case is easily annealed to make the case ductile enough to allow reshaping so that it can be handloaded many times, and fire forming can help accurize the ...
The pre-war headstamp has the 1- or 2-letter code for the brass supplier of the cartridge case at 6 o'clock, the 2-digit year the cartridge case was produced at 12 o'clock, the lot number of the propellant at 9 o'clock, and the 2-digit year the finished cartridge was assembled at 3 o'clock. The brass suppliers or cartridge manufacturers would ...
The ammunition was copper-washed steel-jacketed bullets with copper-washed steel cases. (This makes it magnetic – so it may fail the BATF magnet test used to detect illegal semi-armor-piercing and armor-piercing steel-core penetrators). Some are found in brass cases, and are readily identifiable after firing, as these cases are still Berdan ...
Generally, only new, unfired .223 Remington brass is used for handloading TCU cartridges to avoid the premature case neck splits that can occur when resizing previously-fired .223 Remington brass with TCU reloading dies. Done this way, TCU sized brass generally becomes as reliable for multiple reloadings as any other handgun cartridge case.
The expensive individual brass cases can be reused after replacing the primer, gunpowder and projectile. Handloading reuse is an advantage for rifles using obsolete or hard-to-find centerfire cartridges such as the 6.5×54mm Mannlicher–Schönauer, or larger calibers such as the .458 Lott, for which ammunition can be expensive.
Cases are formed by necking down standard .303 British brass with a full length 303/25 sizing die. 303 British brass is available from Remington, Federal, Winchester, Sellier & Bellot, Prvi Partisan amongst others. Reloading dies are still available from Australian company Simplex, in single, two and three die sets.
.375 SOCOM head stamped brass is available from SBR Ammunition and reloading dies are available from Tromix, Redding, CH4D, Hornady, and Lee. Reloaders can form their own .375 SOCOM brass using the parent .458 SOCOM case, but they must first run the cases through a .375 SOCOM full length size die. Reloading data is available directly from Tromix.
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