20" crossbow arrows are a lot less stable than 30" vertical bow arrows. Using large fixed blade broadheads on crossbow arrows can be tricky. If all you do is bowhunt with your crossbow, sight it in with the broadhead of your choice that will group well at your expected shot ranges. If you shoot a lot and want your field points and broadheads to not be an issue as to POI, one sure way of achieving that with no hassles is to use a premium expandable head like NAP's. Problem solved.