double tap :

• Bonus is applied to the weapon's total damage including Mods. For example if the weapon deals 2000 damage, a single stack (20%) will increase the damage output by 400 damage.
• Consecutive hits on enemies increase the damage bonus by 20%, stacking 20 times up to a maximum of +400% bonus damage.
• Misses will reset the damage bonus.
• Additional hits caused by punch through or Multishot will allow each bullet to trigger multiple stacks. When a shot hits at least one enemy it will not reset the bonus.
• Bullet attraction bubbles such as Magnetize, or void status will cause each hit to count twice.

to be test : replace hunter munition with [High Voltage] & primary merciless with primary [Frostbite]