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 By Mike Coviello (Tanner)
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What Is A Rimless Cartridge?

 


38 Special Rimmed Case (Left)
9mm Rimless Case (Right)

How to Shoot Fast & Accurately  

The Gun Digest Book Of Concealed Carry

 

The term rimless cartridge is a misnomer. Rimless cartridges have a rim but it doesn't protrude out as far as other cartridges. The rim has the same diameter as that of the case body. An undercut is provided on the case adjacent to the rim to provide a feature and surface for the extractor to grip.

Note the difference in the rim diameters of the 9mm and 38 special cases shown in the pictures. The rim of the 9mm Luger case is about the same diameter as the case body while the body and rim diameters of the 38 special are notably different.

 

 

 

 

Authored By Mike Coviello (Tanner)

 

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