How about a .264/303? Long story, but I wound up with an 'extra' No.4MkI. I had always wanted something in .264 caliber so, since I had access to a machine shop at the time, I picked up a .264 barrel and made the reamer to create a .303 British necked down to .264. Killed one deer with it years ago, and it has probably been in the safe since.