Board Thread:Off Topic/@comment-27425734-20170826213348/@comment-27144409-20171007014341

Yyou'll definitely want to go with a lighter caliber. I'd recommend somewhere between 16 and 20 gauge. Any lower, and you're going to have trouble delivering enough of a punch to warrant having the shotgun feature.

I'd strongly advise using elemental effects, or recreating certain munitions...

You could potialky fire diversionary grenade rounds, say smoke/steam or flash bang.