For what? Bank takeover? A thug on the street trying to mug you? Nutjob shooting up the mall?
Just depends on several factors. How good are you? Fast? Shoot strait? Cool under pressure?
My Glock 27 has nine rounds of .40, my S&W J Centennial has five. I shoot alot, realistic shooting, but still I dunno if it will be enough. Just depends.
Deaf