Sounds pretty sweet. I don't think explosive rounds add more damage to a single target, but sounds great for crowd control.
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i know in pve the epxlosive rounds do in fact add damage, because te explosion is considered a different entity then the shot which trigger it, it can hit all enemy hit boxes nearby, which includes a additional hit on the body hitbox of npcs, i am not 100% sure it still does this in pvp, but it seems likely.