In this scenario, it is a decade after the apocalypse so most survivors formed communities by now.
I don't think that ammo would be it as most hunting would use bows or traps; hunting with guns would be limited to bolt action rifles or shotguns which generally don't need a lot of ammo at one time as the shells and hulls can be reloaded. I think that alcohol would be a pretty reliable means of exchange for its recreational and medicinal applications. Also individual bottles would carry different values based on its quality as opposed to ammo which only interests the person that has a firearm that happens to use it.
I don't think that ammo would be it as most hunting would use bows or traps; hunting with guns would be limited to bolt action rifles or shotguns which generally don't need a lot of ammo at one time as the shells and hulls can be reloaded. I think that alcohol would be a pretty reliable means of exchange for its recreational and medicinal applications. Also individual bottles would carry different values based on its quality as opposed to ammo which only interests the person that has a firearm that happens to use it.