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Headspace for rimmed cartridges is the space between that forward ledge and the bolt face when the action is closed. [1] The cartridge is said to be rimless if the extractor groove is machined into the head of the case so the rim is the same diameter as the adjacent part of the case. Most modern automatic firearms use rimless cartridges.
2. Cartridge case, which holds all parts together; 3. Propellant, for example, gunpowder or cordite; 4. Rim, which provides the extractor on the firearm a place to grip the casing to remove it from the chamber once fired; 5. Primer, which ignites the propellant. A cartridge, [1][2] also known as a round, is a type of pre-assembled firearm ...
Rim (firearms) A rim is an external flange that is machined, cast, molded, stamped, or pressed around the bottom of a firearms cartridge. Thus, rimmed cartridges are sometimes called "flanged" cartridges. Almost all cartridges feature an extractor or headspacing rim, in spite of the fact that some cartridges are known as "rimless cartridges".
The cartridge was originally designed to headspace on the semi-rimmed case, which worked in the Colt M1900 due to the design of the feed ramp. When the .38 Auto became the .38 Super in the 1911A1, the feed ramp could no longer be used as rim support. As a result, the observed accuracy of the .38 Super suffered until Irv Stone of Bar-Sto barrels ...
Non-shouldered (non-"bottlenecked") magnum rifle cartridges especially could be pushed too far into the chamber and thus cause catastrophic failure of the gun when fired with excessive headspace. The addition of the belt to the casing prevented over-insertion, while allowing smoother feeding from a box magazine compared to a rimmed cartridge.
Belt-fed (M2 or M9 links) The M2 machine gun or Browning .50 caliber machine gun (informally, " Ma Deuce " [14][15]) is a heavy machine gun that was designed near the end of World War I by John Browning. While similar to Browning's M1919 Browning machine gun, which was chambered for the .30-06 cartridge, the M2 uses Browning's larger and more ...
Source (s): Hodgdon Online Reload Data. The .25 Winchester Super Short Magnum is a third member of the Winchester Super Short Magnum (WSSM) cartridge family created by Winchester and Browning. It is the largest caliber of the WSSM line (excluding wildcats) and is the most capable of handling large game such as deer and wild boar.
7mm Remington Magnum. The 7mm Remington Magnum rifle cartridge was introduced as a commercially available round in 1962, [2] along with the new Remington Model 700 bolt-action rifle. It is a member of the belted magnum family that is directly derived from the venerable .375 H&H Magnum. [3] The original purpose of the belted magnum concept taken ...