pf2e.fyi
From Pathfinder Guns & Gears, which isn't enabled.

Black Powder Boost

FEAT 4
Activity 1 action

Requirements You're wielding a loaded firearm.

You fire your weapon as you jump, using the kickback to go farther. You Leap and discharge your firearm to add a +10-foot status bonus to the distance traveled. If you spend 2 actions for Black Powder Boost, you High Jump or Long Jump instead.


Special An ability that allows you to High Jump or Long Jump as a single action (like the Quick Jump skill feat) lets you use Black Powder Boost as a single action for those jumps as well.
Pathfinder Guns & GearsORC