As a bomb disposal friend of mine from Holland told me most accidents in his profession occur with small simple ordinance. 
 
I was given similar cannon balls as a gift, i kept them for a week pondering how to remove the plug to check if they were live or not. Chatted a bit with some knowledgeable friends and came to nothing conclusive. 
 
In the end I put them in my canoe paddled across a v deep lake and dumped them over board. 
 
Be careful with these things much as I love my hobby these things were designed to kill and destroy.  
 
Keep safe and if you don’t know what you have just accept the fact and be careful 
 
 
I am not an expert in ordinance so take my advice as just my opinion.  
 
Regards 
 
Ken
		 
		
		
		
		
		
		
		
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