A twin-barreled field cannon loaded with grapeshot
Stats:
Two fast consecutive shots and then a slow reload
must aim before firing, just like a minigun
Fires grapeshot, like one big catastrophic shotgun blast, similar to scattergun damage but with less damage fall-off
wide spread, 8-12 pellets
low reserve ammo, maybe like 12 shots + two starting shots. ammo is bulky..
Goals:
I think that there are a lot of people who want a 'shotgun' for heavy, but proposals for what it might look like or work like are not very interesting. I have made one heavy shotgun suggestion before, but taht was a secondary. this is trying to fit the 'shotgun primary for heavy' niche but in a more interesting way.
The visual of Heavy carrying around a horse-towed field gun that maybe still has a wheel, would be really fun. Infantry guns like this were used up until the 1890s. Heavy being a big gun enthusiast would probably lead him to having historical pieces. maybe having a russian civil war era field gun, or maybe an older cannon, doesnt seem far fetched.