Rim - A flange at the base of a cartridge case that provides purchase for the firearm's extractor to grasp and remove or eject the spent case. Rim configurations can be as such: Rimmed; Rimless; Belted Rimless; or rebated rimless.
Rimmed cartridges provide the most reliable configuration for extraction. Double and single-shot rifles should be chambered for rimmed cartridges----particularly if the target is inclined to fight back.
"Rimless" Cartridge. The rim is created by turning a groove at the base of the cartridge so that the diameter of the rim is equal to the diameter of the cartridge proper. This arrangement allows for smooth and reliable cycling through a vertically-stacked magazine, such as in a bolt-action repeater.
Belted "Rimless" Cartridge. The additional sharp-edged belt around the base of the cartridge provides a point of reference for establishing correct headspace.
Rebated "Rimless" cartridge---to allow a fat, high-capacity cartridge to cycle through a bolt action rifle with a standard-sized bolt face.
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