Rifts complicator

Turn order

Falling damage

Gravity (m/s/s)
Height (m)
Mass (kg)
Speed (mph)
SDC (dropped object)
SDC (collision)
SDC (falling)

21st century rifle rounds have generally about 1000-3000 Joules when they leave the muzzle, although this is spread over a very small area.

Collision damage takes no account of the relative masses involved, which is important both because energy is directly proportional to mass.