It's a bit confusing that a barrel with such a small size has a bad buoyancy. I think it MIGHT be better if it was Average.
No, the barrel is filled with sand. With this assumption it makes perfect sense to set its buoyancy as Bad.
Didn't think anyone would be receptive to the idea of making the prop's health more bloated, but sure!
I usually don't use non-floatable props, but the ones I do use need to be worth it and balanced. If this prop is going to heavy, 150hp simply isn't enough to push someone to use it.