[Lazamataz]

300 cans of tuna 100 cans soup 100 lbs rice 900 bullets let the shooting begin

You better be planning to collect ammo off the corpses of your opponents. If you have only 900 rounds, that's barely enough for a decent firefight.

I'm well into 5 figures and I feel under-supplied.

[Noumenon]

Tru dat, bro. You can chew through a lot of ammo on a bad day. The other aspect of this that you need many,many loaded magazines. You don’t want to be stuffing mags in the middle of a firefight.

[Armscor38]

If you are shooting that much ammo, you are probably going to end up dead sooner or later as the odds are always in favor of the House.

[Oatka]

You better be planning to collect ammo off the corpses of your opponents. If you have only 900 rounds, that's barely enough for a decent firefight.
I'm well into 5 figures and I feel under-supplied.

Your garage? :-)