Hi Buck,
440C has 16%-18% Chrome. that's the ingredient that categorizes the 440 series. A, B, or C is determined by the carbon content.
8Cr13MoV has 13% Chrome. Quite different.
sal
My mistake. I could swear I remember reading on the sypderco forums here at some point a discussion about the byrd line originally supposed to be 440C, but the steel that came from some china factory wasnt quite 440C, so you guys ended up calling it something else (8Cr13MoV). My memory has been taxed lately with finals and moving, so I may be mistaken.