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Firearms Rules

Burst Fire: As an action, you can expend 10 pieces of a Burst Fire weapon's ammunition to spray shots at n number of targets (proficiency modifier) within the weapon's normal range. Each creature in that area must succeed on a DC 15 Dexterity saving throw or take damage. Roll the weapon's damage once, and apply it to each creature that failed the save.
Fully Automatic: As an action, you can expend the entirity of a Fully Automatic weapon's ammunition to spray shots at n number of targets (proficiency modifier) within the weapon's normal range. Each creature in that area must succeed on a DC 18 Dexterity saving throw or take damage. Roll the weapon's damage once, and apply it to each creature that failed the save.
Reload: You can make a limited number of shots with a Reload weapon. You must then reload the weapon as an action or a Bonus Action. All non-energy weapons have a specified number of shots per reload, see Ammo Capacity.