Firearm Mastery Feats

Explosives Expert
Your knowledge of explosives is unrivaled. You gain the following benefits.
 * Whenever you overload a firearm the misfire score is raised by only 1, instead of 3.
 * Damage caused by the explosive property is increased from 1d8 to 1d10.
 * Whenever you make an ability check to judge or measure the explosive power of a supply of wraithpowder you can treat any roll of 9 or less on the die as a 10.
 * Whenever you use a Powder bomb or Alchemist's fire, you may add your proficiency modifier to any damage roll made. Additionally, the minimum DC of any ability check or saving throw made against these explosives is equal to 8 + your proficiency bonus + your Intelligence bonus.

Longarm Mastery
You gain the following benefits when wielding a musket.
 * If you roll a misfire on an attack, you can use your reaction to roll a d20. If the number rolled is higher than the weapon’s misfire score, the firearm does not misfire. You cannot use this feature of this feat again until you complete a short or long rest.
 * Whenever you take the Attack action on your turn you may reload your weapon in place of one attack roll. Doing so does not cause the reloading condition.

Scattergun Mastery
You gain the following benefits when wielding a dragon pistol or blunderbuss.
 * Once per turn when you deal damage to a creature, you can choose to deal additional damage to one other creature within 5 ft of the original target. This damage is equal to 1d8 for dragon pistols or 1d10 for blunderbusses.
 * Being within 5 feet of a hostile creature doesn’t impose disadvantage on your attack rolls.
 * Enemies no longer gain advantage on their melee attacks against you due to the reloading condition.

Sidearm Mastery
You gain the following benefits when wielding a palm pistol or pistol.
 * Whenever you make an attack roll you can draw and stow the weapon with which you make the attack as a part of the roll.
 * Whenever you reload a sidearm you can additionally reload one other sidearm at the same time.
 * Beginning a reload costs only 5 feet of movement, regardless of your total speed.
 * Whenever you take the attack action of your turn, you can make an attack roll with a pistol or palm pistol as a bonus action.