Hi Chief 
 
While it could have been used to carry powder, I agree with Corrado here.  It would take too long to retrieve the powder with a screw cap.  Especially if needing to re-load for a second shot.   
 
In any case, it is certainly a neat looking flask.  I have no clue as to it's origin. 
What is the approximate length and diameter ? 
 
Rick
		 
		
		
		
		
		
		
		
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