The Brownells site lists ammo by application (i.e., law enforcement, training, self defense, etc.). The implication is that certain ammo is better suited to a particular task. Perhaps based on cost. Perhaps based on stopping effectiveness. Perhaps based on accuracy. I'm wondering, for home defense needs, why wouldn't, or why would, a training type ammo be as effective as a law enforcement type ammo or, a self defense type ammo? What are the difference to be considered when evaluating these rounds for a given neede?