Hey! Just started a new character who's all about Big guns, and I'm wondering what the earliest way is to get a big gun and decent ammo for it early in the game.

I think just outside Big Town to the northeast by a truck there are a few Super Mutants, I think one of them carries a minigun. Or in the truck itself there's one.

I think you can buy some 5mm ammo from Moira. Other than that, it's pretty tough to find Big Guns in the early game.

Hope that helps.