A rather reasonable guess, Richard. 
But then, a couple things to figure out ... 
- Lack of a handle; could it have fallen with time ? 
- Its conical format; aren't loading chambers more cylindrical, only tapering in their very end to couple (seal) with the barrel ?  
Judging by its outer condition, it sure looks rather early. The bore opening looks perfect, though. 
Let us see if a straight front picture and its dimensions enlighten us a bit further.
		 
		
		
		
		
		
		
		
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