As Kronckew has implied, this gun may be a cannon, it is certainly not a canon (the church would be horrified!).   Seriously though, in fact it is not a carronade either - these large bore, short range guns were much more built up at the breech, tapering more to the muzzle with (usually) a step down immediately before the muzzle itself.  Also they did not have trunnions, in order to fit narrow spaces; instead they were fitted to the carriage by a loop underneath the barrel which swivelled vertically on a bracket fixed to the carriage.  Hope this helps the discussion. 
Neil
		 
		
		
		
		
		
		
		
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