You’ve decided that your business will have an insatiable demand for ammunition. No problem.
But that’s only half the equation.
Remember - the midwife, the electrician, the guy who delivers the fuel-oil: they need a form of payment that meets THEIR requirements.
Will they be able to buy morphine or replace car-parts with ammunition?
Plausibly in a Mad Max world, but even then they face a huge amount of attrition in ammunition barter. How many 22 LR to a 45 ball, or a 45 blank, or various gauges of shotgun ammo?
But Gold and silver - every one wants them, because they solve the coincidence of wants, and they won’t have to wander over Arizona trying to get change for a .50 BMG round.
The premise is Venezuela.
The premise is NOT an economic depression or Weimer Republic. The conditions are Sarajevo when humans turn savage ready to kill for food, firewood. Yes, some medicines but beans and bullets are the primary currency.
Most don’t know how to evaluate gold as currency. Ammo is ~$1/round (.22LR about a quarter, .50BMG five-ten bucks). Anyone with a gun will know what ammo is worth to them. Trade in popular caliber is easy; I may not have .45ACP guns, but have (and will accept) a few boxes anyway to trade for 9mm or 5.56. Half the population has guns, and I have tradable ammo usable in half of those. Swapping a box of 9mm for 50 lbs flour, or selling that box for currency to quickly buy flour with, is easy to arrange; far less easy with gold.