page_title: Rim (firearms)
section_title: Types
hierarchical_section_title: Rim (firearms) / Types
context_page_description: 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 rim may serve a number of purposes, including providing a lip for the extractor to engage, and sometimes serving to headspace the cartridge.
context_section_description: There are various types of firearms rims in use in modern ammunition. The main types are categorized as rimmed, rimless, semi-rimmed, rebated rim, and belted.  These describe the size of the rim in relation to the base of the case.
caption: Rimmed .357 Magnum revolver ammunition
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