Jeff, the drawing shown so far is for the 12x42R Norwegian RF. What you requested is a drawing of the 12x44R RF. I have a copy of the official 1871 12x44R RF drawing, and tried to post it, but was unable to figure out how to do it. The dimensions you need are the following: Rim diameter 16.03mm, base diameter 13.96mm, mouth diameter 13.20mm, rim thickness 1.63mm and total case length 43.60mm. The correct bullet diameter is max 12.60mm, so the internal case mouth would have to be the same.
Please note that the 12mm RF cartridges were not 12.7mm. This converts to .50 caliber, but both the rimfire and centerfire versions have nothing to do with .50 caliber. The RF cartridges were called “4 line copper cartridges” until 1879, after Norway converted to the metric system in 1875. In Norway the centerfire 12x44R were usually called 12mm, whereas in Sweden and Germany they were called 12.7mm.