Current confirmed detail

The 1.0 patch notes identify a fix for an ammo slot becoming unavailable after clearing an ammunition type with no bullets left. This confirms an ammo-slot edge case was addressed; it does not establish the current carrying capacity or the full list of available ammunition.

Historical instructions and current check

The official Ammo Change article explains the feature during Early Access, and an FAQ section describes purchasing and equipping loadouts. That text also contains a note about bows receiving alternate ammunition after full release, showing that part of the procedure predates 1.0. Confirm the current slot count, compatible weapon, and available ammo in your 1.0 Shop/Storage screen before planning a loadout.