“ The .45, because shooting twice is just silly.”
I’ve been thru many stress drills/trainings with “it has to start with 4” buddies.
I usually get more hits in shorter time with a 9.
Quantity has a quality all its own.
Not to mention that modern defensive ammo has 50% expansion, so a 9mm round (.355) will enlarge to .5325.
Larger than the sacred .45