[azgrimm]

I have noted that if the bullet is using the gun as a vehicle (nested as it were)
that the bullet will turn with the gun. The effect seems rather negligible if you minimize the travel/return duration though.

Collision detection seems relatively accurate to me, aside from the fact that Alice only allows for box colliders rather than more form fitting mesh colliders.
It would require more checks, but you could set up sub-object collision, thusly registering head/limb/body shots reducing some of the empty collider space.