Got it quite a while, but didn't play with it until I started a new project: security evaluation of each casino in strip lol
Then I quickly check GECK and find out it benefit from both Pyromaniac and Demolition expert; both of them a multiplier so I can get 2.4 times the damge out of it!
Seriously, I can justify using a minigun other than the whole KEEP ON SHOOTING feel. I mean I have been using 5mm as caps in FO3 and just break every single 5mm I can find for Handloading.