What an idiot! Already done by Jeffery!
Quote:
In 1908, W.J. Jeffery & Co created the .333 Jeffery by shortening the .404 case, giving it greater taper and necking it down to .333 in (8.5 mm).[5] In 1913, Jeffery further necked down the .333 Jeffery to .288 inches, creating the .280 Jeffery.
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