Here's what the heavy cube ammo will do from a simple launcher with hand held pouch. Bands are triple Theraband gold. Target is a thin file cabinet( .015inch steel). The ones that break through puncture the inside of the back. Hopefully have a pumpgun ready in a few weeks for this ammo. http://www.youtube.com/watch?v=PqC7ih5clb8&feature=youtube_gdata_player http:// Forgive the video quality, last time I shot/edited a movie it involved two VCRs Here's a shot closer up.