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This is more Doshii's bag I'm afraid. But, for close quarters, the SAoY primarily use the NSP Submachinegun or the standard NSP. I'm not discouraging you, I'm just saying that's what comes up. I like the idea of a shotgun to be perfectly honest with you, but I'm no firearms expert.
Alright, hopefully I put in enough detail to be acceptable, its suppose to operate like a traditional combat shotgun. As for DR, I don't understand too much about it so I am open to suggestions, but I would think it wouldn't need to be very high since it's suppose to be s very generic weapon.
Well, a plasma loaded cartridge would lay on the pain. Superheated gas = bad for the skin and flesh...and bone... Erm. As for DR ratings, going over the Damage Rating System should help. That is if you haven't already.