A reproduction late-15th C breach-loading gun

Here is our old beast in action at Flagstaff Hill, Warrnambool many years ago. It is a reproduction of a 15th century (Burgundian?) breach-loading gun. It had a 3" bore by memory and could lob a concrete cannon-ball a fair distance. Not long after these pictures were taken we found a retired Yugoslavian wheelwright who made us a proper set of wheels (it had borrowed cart wheels).

Note in the picture above that we were using horse poo for wadding (bottom right) very effective and gave the demonstration a certain ambience!