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My thinking behind a .22LR (or similar) rimless case is this: The cartridges would stack up easier and more uniform in a magazine - huge increase in capacity, with minimal increase in magazine or firearm design. Also, there should be a corresponding increase in reliable feeding.
Or, what if you increased the overall width of the cartridge so that the rim of the .22 is no longer protruding, yet keeping it technically rimfire.
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