belted magnum

any cartridge, but generally a rifle cartridge, with a shell casing that has a pronounced "belt" around its base that continues 2–4 mm past the extractor groove. 
belted case

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Wikidata
weapon functional class, 

• Freebase entry^@
  

• 

  20 × 42mmB
  

20 × 42mmB – cartridge – weapon functional class – 

Frameless

Type	Date	Description	Keywords	Notes	Source
link		Freebase entry@			Wikidata
weapon		20 × 42mmB	weapon model, cannon cartridge, belted magnum, 20 mm cartridge		Wikidata

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