Not exactly....a friend of mine asked a PA State Police chopper pilot, where you would aim, (hypothetically, of course) to bring down a chopper with a rifle/pistol. The pilot looked at him in amazement and said, "At the pilot".
But, my point was "stockpiling ammo" has it's practical limits. I try to keep at least 10k round cases of the common stuff, plus a variety of other calibers. The fact remains, however good your plans and intentions may be, if you become a pain in the ass to the government, they'll eliminate the problem(you) with a precision sledgehammer.
They work on the asking forgiveness rather than asking permission theory, except they don't ask forgiveness.
Uh oh, it's Saturday night.