What good would ‘lead and brass’ be unless you were planning on stealing what other people have? We’re talking hyperinflation here - not war.
Bullets would be very valuable in a barter economy, which is what would happen during hyper inflation. The self defense value is also a plus.
Look at current supplies: “lead and brass” are selling out as fast as rounds can be manufactured. Value per round is about $1, a convenient financial size, and usually sold in boxes of 20-1000 (again, convenient financial value per package). They’re a standard size (maybe 20 popular calibers, easily traded), last indefinitely, and have intrinsic value. As hyperinflation hits, fiat currency cost per each will remain at least on par, additionally increasing in value as intrinsic demand increases.
Contrast with gold, which at >$1000/oz is almost too valuable for mundane use (try buying a bag of flour with it from a neighbor, vs a couple rounds of .308).
Having ammo doesn’t inherently mean intent to steal/kill. It’s a popular robust commodity which would prove commonly useful in retaining & trading value.