Filipino cannons

[Edster]

Peter,

You say "since the 37mm gun as bolts into the chamber that will make removal of the castings difficult."

This suggests that a 37mm round could not be effectively inserted into the breach. Maybe a subcaliber insert was used to fire a smaller round. Also, a cast breach/barrel was likely made to take black powder pressure and not that of a modern round. Just a thought.

Ed