That would make it very realistic.
Just an idea.
Then, casualties with the exploded gun.
And, a few more things...
In the Civil War, if one gun ran out of too many men, men would double up on another gun.
In addition, each gun had extra men to do the jobs.
And, if someone gets killed, it would be cool if that graphic wasn't there, and it took more time to load (assuming all the replacement gunners were killed/wounded.
Finally, I don't know if you got my post about gunners fighting back during a gun capture.
Realisticly, a calvary company might try to storm a battery, and might capture half but get eaten by cannister so much that it would retreat.