Try this with your CCW choice: Put a standard size paper plate out to about 3 yards. Load your weapon w/your chosen defense round then empty the gun at the target, shooting as fast as you can. If all your rounds stay on the plate you're in good shape w/respect to follow-up shots and your ability to defend yourself

One shots stops are mostly a myth and you continue shooting until your attacker falls, and then reload and keep a close eye on him until help arrives.

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Old Cop
LEO (Ret.)