I assume both drones and armored humans would both be potential targets if fighting breaks out. If that is the case, I don't want to juggle munitions on the field, so it needs to be deadly against both. 00 Buckshot is what I use for practice because it costs me about $14 a box for 25 rounds. 000 is what I am figuring to use as 'serious' ammo for live combat, but that costs about $10 for 5 shells.

The way I figure, 000 would be able to hit unarmored limbs, and consequently remove combatants from the fight. Dunno if a slug can beat armor, but I am almost certain that my accuracy is too crap to land a slug on a person. I can regularly land hits at 25 meters with a reflex sight, but that is with plentiful time, an immobile target, and no pressure.

Hopefully, if I join a militia, we would be able to hire a Ukranian veteran to instruct people. My guesses about how to prepare for conflict are probably wrong.