I was intending to hold fire on Medieval Cannons and other gunpowder weapons but now is as good a time as any with my first detail being to point members to the brilliant work done by Michael (RIP) (Matchlock) whose attention to detail was unveiled in some magnificent treatise and excellent discussions on a subject he seemed to know as if they only appeared yesterday; such was his enthusiasm.
Reference. Just type into search or press on http://www.vikingsword.com/vb/search...earchid=860408
~ and simply chose from a myriad of different topics on the subject.
See also the two cannon below from
http://www.medievalists.net/2009/08/...owder-recipes/
See The seige of Orleans (pink fort)below from
https://en.wikipedia.org/wiki/Gunpow...ge_orleans.jpg