Destraex, I have respect for you in regards to SimHQ, so I am saying this with all due respect.
Reloading by the mouth a canon like that inside a moving ship must have been something of a concept we are all foreign from, let alone the conditions in which it was done.
Beside, those canons did not have wheels with teeth mechanism for elevation memory, their elevations was guaranteed by a wooden wedge (like a door block) stuck between the support of the beast and the beast itself. Wooden wedge that was certainly moved with the recoil and heat.
Then, they were not mounted on rails, but on wooden uneven rounded wheels, semi-rolling on a hardwood floor alike, held by ropes.
I am confident that they would have to start from almost zero after each reload.
All those stages of control of lack thereof, must be reproduced in one way or another in the game.
Moreover, those canons were not rifled and used balls instead of miniballs, hence notoriously inaccurate.