how long would all this stockpiled ammo last? a few weeks? So you reused the bullet casing, so what? how quickly can refill a few hundred? where will the powder come from?
The Vietnamese defeated the US, but it took about 10 years, and the Soviet Union was spending billions resupplying them.
OWS and BLM have a better chance of overthrowing those in power in the US through protests than do these white militia. That's why those in power crack down on them harder