These were sold commercially in the U.S. in the 1980s. The C.A. stands for Century Arms which was the very large firearms importer in St.Albans, Vermont. These cartridges were loaded by Norma of Sweden with a 140 grain soft point bullet. The NP on the primer is for Norma Precision and are typical of Norma manufacture. (not all Norma ammo have the NP on the primer).