Apropos my earlier post on Rigby's involvement in the popularisation of the .470 N.E. cartridge, Rigby was right on the heels of Joseph Lang; the first .470's to appear in Rigby's books were Nos. 17414 and 17418, dated February 1908 and December 1908 respectively.

The records show that they were light for .470's and may well have been rebored from .450 before they were ever sold, presumably because they would have been unsaleable because of the bans on that bore size that most likely had come into effect while they were in production.

Several other .470's started out this way, and it was also common practice for owners to send a .450's back to the factory for re-boring to get around the prohibition.