I use this to set the vanilla's audio clips for a few sounds I want to change.
<set xpath="/Sounds/SoundDataNode[@name='quest_master_complete']/AudioClip/@ClipName">#@modfolder:Resources/TelricsQuestWorld.unity3d?SoundEffectHeroicQuestComplete</set>
You'd have to change out each audio clip, if it has multiple, but that's the way I'd do it. Also note, i do believe reload sounds are actually part of the animation now, not just a sound effect. I may be wrong, but pretty sure i'm right on that.