Zerginfestor
Learned
Weapon Damage is taken to the power of 1.366 when calculating final damage, so Minigun's low damage is even more pathetic than it seems.
If you want to go Heavy Weapon, get Ashmaker http://fallout.wikia.com/wiki/Ashmaker. Or some legendary Minigun with bonus damage. Or Laser Minigun which runs off Fusion Cores and yes, Nuclear Science makes cores last longer for them too too.
Don't bother. Minigun ammo is too easily spent and the only reliable way to get them is to snipe off vertibird minigunner or download a craftable ammo mod.
Or just buy it. If you assign weapon vendor in settlement he/she will sell ammo.
So basically, it's essential to have the Local Leader perk in order to get Heavy Weapon ammo, right?