An improved projectile trap assembly includes a frame that supports a channel and a containment chamber. The containment chamber has an ingress point receiving a fired bullet and an egress point for distributing the bullet. The containment chamber is supported by a pair of bulkhead plates that are connected to the frame. Each bulkhead plate defines an aperture, with a scroll assembly being mounted between bulkhead plates proximate the aperture. The scroll assembly includes a front scroll affixed and a rear scroll detachably connected to the bulkhead plates. A side plate is detachably connected to the bulkhead plate opposite said front and rear scrolls to seal the scroll assembly to receive bullets. The containment chamber additionally includes upper and lower trap plates that are positioned proximate upper and lower channel plates at the ingress point. Finally, a plurality of collection buckets positioned below said front scroll in an adjustable position.