Where you put the bullet is far more important than diameter, velocity or type of bullet. Having said that, hardball certainly wouldn't be my first choice.

Mr. Smith may use that as his choice, guided by his training, experience and tactical situation. Just because he does so, does not make it a wise choice for you.

BTW, one of my once upon a time neighbors was negligently shot with .45 hardball across a coffee table. The bullet entered the mouth, and departed through the neck without inflicting serious injury. The round nose bullet considerately pushed all the important stuff (arteries and such) out of the way enroute.