I know you guys love the idea of machinegun build with this thing and Splintering Bolts. just as I do. I tested it out a few times, it deals next to no damage with splintering bolts in WA bolt barrage even at medium distance (where Splintering Bolts would shine when used with Avelyn or something similar).
So do you, know that when you fire Splintering Bolts it looks like big bundle of bolts that deals little damage when it hits, but if it flies it splinters to many little bolts with similar damage, delivering that "shotgun effect" at middle distance? Repeating Crossbow's WA has a bug where Splintering bolts just don't "splinter" sometimes as if you would hit people at a point blank range, so even visually volley of bolts looks almost the same with any regular kind of bolt. Pretty disappointing, really.
So if you really want it, you can try and solve something out of this combo, but I am warning you that it's probably not gonna neither look cool nor be effective. It's much better off being used with something that is not a Splintering or Explosive kind of bolt.