I’m a big fan of single shots and could get by handily without repeaters in the field. People yap and drone about ballistics and don’t realize at all how much power standard chambering actually develop. If you are picky about the shots you take a single shot will do ya just fine.
This one reminds me of the custom jobs that some of the gun geeks at Cast Boolits. Some of those guys are so talented that they make their own guns from bars of steel and planks of wood. I wish I had more info on this one…but a pic is all I got.