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You might be correct if it falls into the obsolete calibre list. ".450/ .400 Black Powder in case lengths of 2 3/8″, 2 7/8″, 2 19/32″ Thomas Turner No 2, 2 ¾” Westley Richards and 3 1/4. Also the .450.400 3″ Jeffrey (H)" More details http://www.vintageguns.co.uk/articles/obsolete-calibre-list |