Wildcat Cartridge Series - 458 x 2" American
The first time I saw this cartridge was in a 1903 Springfield that belonged to a friend of mine. He only shot cast bullets out of it and announced that he would keep it all of his life. I haven't seen him in about 20 years...I wonder!
The rifle was a pretty good shooter and met the requirements (at the time) of a bolt action .45-70 as opposed to the Siamese Mauser. I'm not sure it was a good choice but it performed as advertised.