what is the absolute upper bound on the size of gunpowder cannons, (not rail guns or similar) in terms of shell weight and bore diameter before some mechanical or material problem prevents it from being usable?
- Assume today's technology.
- The projectile should be a metal ball
- The gunpowder should be fed loose, not in a cartridge.
- The cannon should be able to be used more than once without destroying itself.
- The cannon should have a range greater than 2km
I'm specifically looking for the limit of the materials that contain the explosion.
For example: The metals will crack if more than "X" kg of gunpowder explodes inside, or the firing mechanism will be too damaged in the explosion for the cannon to be reused.