I don't know the size of the bore, but it is capable of being shot. However if you do, only use black powder, or a modern substitute for black powder. It is entirely possible to blow
that cannon up using modern smokeless powder. Using a little wadding, made out of rolled up paper on top of about 30 grains of black powder, and you will get a nice bang and lots of smoke.
You could also put a projectile on top of 20 or 30 grains of black powder, and you would have the same thing as a muzzle loading black powder pistol, and the ball will come out
of the bore at high velocity, so be sure it's pointed in a safe direction, and use a fuse in the touch hole so that you can be well out of the way, and NOT directly behind it when
it goes off. It will recoil -- for every action there is an opposite and equal reaction. If you don't know what you are doing you could have a very fancy pipe bomb, so the key word is,
be careful.