Black powder used in some areas of the sub Sahara is "home made" and of large grain size, requiring more than what we in the "west" are used to charge a gun. That could be the reason that the flask is so large. 
 
Hi Stu. 
Yes, good point.  I've noticed that most of the horn-shaped Ethno powder containers tend to be larger than what were normally carried in Europe and North America.  
 
Rick
		 
		
		
		
		
		
		
		
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