Then there is the story recounted by Mike Nesbitt in the May 1985 issue of Handloader Magazine (reprinted in the Jay Kimmel Book, Savage and Stevens Arms) where "Cougar Pete", a government hunter in the Northwest, liked the .303 Savage cartridge so well he had a Winchester Model 94 in
.30-30 rechambered for the .303 Savage. As he did not have the barrel set back, the rifle was "dual chambered", but fired cases would come out with a double shoulder. Imagine picking that '94 up in an auction on GB...