The rifle is a .416 Rigby, built by H. Mahillon, a fine gunmaker from Belguim.
Bill,
It is a whole bunch of cartridge for a standard mauser but it has been done sucessfully before by Rigby themselves. Harry Selby's .416 Rigby was built in the 50s on a standard length mauser. I myself have zero interest in making a .416 Rigby feed properly on a standard length mauser, I can only imagine the fun that entails. You are quite correct about the .404 on standard mausers, a beautiful fit but much more of challenge since Duane has sold his bottom metal business.
Steve
