The promise of a minigun's RPM on the chaingun got me excited, so I set a 10 second timer and held down the fire button. In that time, I had launched 178 rounds, so 17.8 rounds per second, so we hit an RPM of 1,068.
An actual minigun has multiple settings, but the lowest is generally 2,000 RPM, with a cap of 6,000 RPM. If we double the shots per bullet, we'll start approaching an actual minigun... but hey, this is still way more impressive than vanilla!
Also, the SSG always gibs now and this was Not Mentioned in the text. That's sick AF.