Talk:Rhino/@comment-193.81.43.187-20151217171042/@comment-184.91.38.42-20151218214015

It counts armor at the time of activation, this includes modded armor value and power strength, and any temporary buffs you might have to those things at the time such as extra armor from the Ironclad Charge augment, Arcane Guardian, and similar temporary buffs.

So yes your Ironclad Charge idea does work, as do a few other things. If you just want comically large Iron Skin values besides modding for it I'd suggest standing infront of an orokin void laser then turning on iron skin to let it absorb the damage for the the few invulnerability seconds and ramp up its values even higher. The void lasers will end up doing just under 5k damage or so total to the invulnerable Iron Skin and give you a decently nice buff. Before you get too carried away self damage to buff Iron Skin has already been "fixed".