.380 2 1/4" Rigby Magnum (Express?) question

Hi All, I’m trying to get some more information on the .380 2 1/4" Rigby Magnum:

  1. I have a reference that says the bullet diameter is 0.360". Is that correct? Then why is it called a .380?
  2. Does anyone know the date this round was introduced?
  3. What is the correct name for the cartridge? (.380 2 1/4" Rigby Express or Rigby Magnum or Rigby Magnum Express?)
    Thanks! You guys are all awesome sources of knowledge!
    Joel

Joel
I cannot give you particulars about this round like when it was introduced! The way you write I am
not sure do you own a specimen?? I f not I can send you a pic with a Head stamp
Sherryl

No I don’t have one. I am building a display for them and I will add them as I collect them. I wasn’t 100% sure the round actually existed.
Joel

Joel
Here are some pics,the info i give you is out of Hoyem Vol3 his title for the round is 380-21/4 inch Rigby
The term Express is Generic and is used for light holloe point bullets the load for this round is 54 gr
of black powder and a 164 gr hollow point bullet without a copper tube.The case was made by Eley
but the case was charged and bulleted by John Rigby.A 13/4 inch case in this cal also exist.
Sherryl