12.7 X 44R F.H.

This was probably the first conversion of the 12x44R Remington M71 rimfire cartridge. It resembles the U.S. 50-70 Government cartridge, but has a smaller base and rim diameter. It was introduced circa 1881 and continued in production until about 1920. The cartridge...

12 X 48.5R LA

This cartridge is one of two shown in the c1900 RWS/Utendoerffer catalog as "L.A."  in the "various types" section. The other was the 11.25x54.5R L.A. (GSP48). Both have 12.65mm bases with 14.5mm rim diameters and could have originated from 12mm metallic...