This must be one of the things every experienced cannon enthusiast knows the answer to, but doesn't get talked about much.
I have seen a few cannon in real life, and many in photos, which had a wooden, well I guess you'd call it a 'plug', stuck into the muzzle.
I presume that these are to prevent debris getting into the barrel, but I don't know if they are historically accurate, or something that places that display historical cannon do to prevent people from dropping coke cans down the bore.
My best guess is that they are a device that was used when the cannon were being stored/transported to keep debris and rain etc from entering the bore, but I'd like to be educated a bit more about them, including what they're actually called!
Does anyone actually use these on their replica cannon?
How long is the part that goes into the bore?