Son of Gael and mart get kudo's.

Birts designate the case first, bullet diameter is the second number.

So Son of Gael's example of the 450-400 designateds a .40 caliber bullet loaded into a .450 case. Way back when, that told the shooter something, they knew they were basing it off (usually) that makers .450 case, but it wasn't long before they were confused as all hell, as everyone got into it with their own version of a 450-400.

So that makes me wonder, is the 38-44 in question, is it a black powder express, nitro express? Based on a Alexander Henry, Rigby, or H&H case?