When the sleeve of your shirt lights on fire or you smell burnt hair after firing.
I shoot a 357Max, the best time I ever had was one spring evening; warm and damp and mosquitoes were terrible, fired a few shots and noticed a bunch of near dead mosquitoes on the bench, started waiting for my forearms to fill with blood suckers and then fire a round, my accuracy went down, but it was a great time watching the pile of dead and dying blood suckers...When the sleeve of your shirt lights on fire or you smell burnt hair after firing.
Now imagine that inside your house at night against a bad guy.
I would opine that a fireball that sets your hair on fire is too much.No such thing as too much fireball
Now imagine that inside your house at night against a bad guy.