Does mechanic have innate 30% ignore defense?

Testing on my Lv.40 Mech, with 1 Atomic Hammer (11% ignore def), 1035 range, 56% gatling gun, against 25% PDR Dojo bosses.
Highest hit obs. -> 556.
Theoretical max (0% PDR): 579
-> 4% or less total PDR (out of 25%)

Um... that doesn't really work.
Let's assume "Heavy Weapon Mastery" is lying, and I don't actually have 56% gatling gun, it's still doing 70%...
Obs max -> 556
Theoretical max (0% PDR) -> 724
Percent of damage -> 76.7% -> 23.3% pdr or less
89% of 25% pdr = 22.25% pdr
theoretical max (22.25% pdr) -> 562

So... two things.
- Gatling Gun still does 70% x 6, even though the skill says 56% x 6
- Atomic Hammer's ignore def works on Gatling Gun


edt. saw a 644 on a normal 10% def mob. So yeah, definitely not 56% on Gatling Gun.