This is cheating a bit, since it actually falls into the category of medium bores I once owned but wish I had never let go.

Both are in caliber .400/.350 Rigby. One is a Westley Richards Ovundo drop lock double rifle and the other is a Rigby based on the Oberndorf slant box magnum Mauser action. I let them go in the early 1970's, since there was no source for the 300 grain bullets which John Taylor praised so highly in his book.