[Yosemitest]

Your target his a man, and if he's wearing body armor, then your target is to cut his spinal cord, just below the brain,
If you're facing him directly, aim for his nose, just below the eyes.

Caliber ?
Anything large enough to do the job; i.e. ... (cheapest) 7.62x39, or.40 or .45 in hollow point.

Ammo amount ?
Once all hell breaks loose, ammo will be impossible to get; so a minimum of 3,000 rounds for a start.

[eyedigress]

Your at a Christmas Party with chips and dip.

3,000 rounds in the morning with the Roast Ham probably won’t work.