Lol. 500 rounds is still the break-in period for most guns. Even assuming his don't need the break-in to smooth the action, barrel life alone is like 60,000 rounds before it's shot out.
The power creep w/ gunpowder et all is going to get ridiculous. That said, right now he's not out of scale of what a court mage can do, other than his way is far more distributable.