A silly question ... for a change
			 
			 
			
		
		
		
			
			Instead of looking at it as a bronze cannon with an iron sleeve, why not thinking of it as being an iron cannon with a bronze cover ? The muzzle face has a story to tell, as maybe also that touch hole into a recess. Also the owner could tell us something like, for one, the actual touch hole face being iron. 
I know this risks to be completelty silly but, i was 'inspired' by a blunderbuss of mine which, instead of having what 'should' be a bronze muzzle section, has only a bronze covering pellicle ... for decoration sake. 
 
 
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