2024 rules reference for Ammunition, +3.
Weapon (Very Rare)
You have a +3 bonus to attack rolls and damage rolls made with this piece of magic ammunition. The bonus is determined by the rarity of the ammunition. Once it hits a target, the ammunition is no longer magical.
This ammunition is typically found or sold in quantities of ten or twenty pieces. Ten pieces of this ammunition are equivalent in value to a potion of the same rarity.