Hmm... I want to get some of my facts straight before I potentially have to throw Gram into combat. 

So VK! That means two questions for yourself:

1. What is the acceptable amount of force I'm allowed to use for Gram's attacks? For some reason I'm imagining him leaving craters/holes of a 5m radius, if you need a personal reference.
2. What can Gram tank with his shield? I just need a general guideline. Mine was 'no sells explosives/insubstantial attacks, deflects solid projectiles fired from anything less than an anti-materiel rifle, melee's the way to go and force will still push him back'.