In insane campaign you will come across a lot of mechs with shotguns, try to avoid them by reloading page in the mission. The shotgun will always do massive damage. I got 296 damage on the shotgun. So, any type will massacre you. Never once have I seen one do low damage. They all do massive damage with shotgun.
But this is just… INSANE!! And as for the tip for the future, BE CAREFUL WHAT YOU WISH FOR, BECAUSE EVENTUALLY YOU MIGHT GET IT! Isn’t it ironic?
I been wishing for the same thing for the longest time, and still haven’t gotten it.