Damage: 8d3 (plasma, "automatic" shotgun type)
Shotgun type refers to the shotgun projectile (
go here for info). There's basically three ranges: normal (i.e., shotgun), wide (i.e., double) and focused (i.e., combat): the fourth "plasma" is specifically for the plasma shotgun, but I always considered it overpowered, doubly so if we make the gun regenerate, so it wouldn't be used on this weapon.
I'd rather the damage stay in the lower range (possibly even 6d3) because of plasma's ability to cut through armor. Unfortunately shotguns are always hard to balance, because they're a very easy weapon to exploit.