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I have seen threads on Shooters.com re: the 6.5/303 British wildcat and a round known as the 6.5/303 Epps. I don't know anything about them, but would guess them to be excellent hunting rounds and would likely make decent long distance match rounds as well.

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There was never a rimless .303 case, at least not in England! But there is a 6.5X53R rimmed Dutch Mannlicher case that is about the same as the rimless 6.5X54 Mannlicher-Schoenauer case. A number of British rifles were built using the rimmed version, and both of these rounds would look a lot like a 6.5X55 Swedish Mauser case, except they are smaller around at the head.

Keep yore powder dry!!