Well we are making progress "pearl" also the nickname of Texas druggie the late (thanks to Southern comfort and heroin) Janis Joplin. I can see pearl as a woman's name, but for a hombre. As Gen. George Patton said en re: pearl as a material for making handles for 1878 Colt .45 SAA revolvers (his personal favorite)-- Only a cheap pimp in a New Orleans Whorehouse--
Your Kraut pal Gunmaker (Buchsenmacher)may be right about Buffalo Arms as a source for this way odd-ball .43 ammo. Doubt if you can get reloading dies for it either- Muy Buena Suerte en su questo, Cabrone--!!