I strongly question the usefulness of +15% damage on a fully charged bodyshot; that increases the damage to like 173, which is not even enough to oneshot a demoman or pyro. Yeah, it's still more damage, they'll be in single digit HP if they survive and they'll die if they're not full health, but it still seems useless. It doesn't oneshot 125 HP classes being overhealed by a medic either!
The penetration effect is the only thing that it'll be good for, but I don't know how good that is either. It's probably better the spammier the map/player count is. But usually I'd honestly rather have the ability to fire unscoped shots.