[moose_nukelz]

There are a couple basic things to consider, the grain weight of the round and how fast it is moving. The higher the grain weight means there is more mass and the faster it goes means there is more kinetic energy impacting the target. The hotter the load means it will do more damage, but the down side is there is usually more recoil to manage. Other things to consider for defensive ammo is expansion and weight retention.