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Berden primed cartridges also have a double flash hole, making their removal difficult because the standard decapping die only has a single decapping pin. 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 ...
Removing the spent primer from (decapping) these cases requires the use of a special tool because the primer anvil (on which the primer compound is crushed) is an integral part of the case and the case, therefore, does not have a central hole through which a decapping tool can push the primer out from the inside, as is done with Boxer primers ...
Berdan and Boxer primers are used in centerfire cartridges; the primers differ in construction. Various priming mixtures have been used in different sized primers to effect prompt ignition of the powder charge. Particles with relatively high heat capacity are required to promptly ignite smokeless powder deterrent coatings. Some priming ...
Removal of the primer, called decapping or depriming, is usually done with a die containing a steel pin that punches out the primer from inside the case. Berdan primed cases require a different technique, either a hydraulic ram or a hook that punctures the primer cup and levers it out from the bottom. Military cases often have crimped-in ...
Berdan primers have remained essentially the same functionally to the present day. Berdan primers are similar to the caps used in the caplock system, being small metal cups with pressure-sensitive explosive in them. Modern Berdan primers are pressed into the "primer pocket" of a Berdan-type cartridge case, where they fit slightly below flush ...
Most surplus ammunition is steel-cased and uses Berdan primers, which effectively hinders its use for handloading. However, with the increased popularity of surplus Eastern-bloc Mosin–Nagant, SVT-40, and PSL rifles in the United States, Boxer-primed ammunition and unfired cases are increasingly available; these cases take large rifle primers.
The 10.7×58mmR cartridge used in the Berdan was also invented by Hiram Berdan, with the assistance of Russian colonel Alexander Gorlov . It was the subject of many patents in both the United States and United Kingdom. The bottleneck cartridge case used the Berdan primer, its first use in a small arms cartridge.
Early new production (marked "RBA") used Berdan primed brass cases. Full production (marked "RIVERBRAND") used newly manufactured Boxer-primed cases in a variety of service pistol and "wildcat" sporting rifle cartridges, as well as new brass for handloaders. They also made ammo for Sportco in Adelaide under the SPORTCO headstamp. Riverbrand was ...