In this video I show you how to put a roll crimp on some 12 gauge hulls with a ballistic products incorporated (BPI) 12 gauge roll crimp tool. It is really easy if you preheat the tool and learn from your mistakes (or from mine that I show in the video). Makes a great looking shell AND they shoot well. Got to put a good tight crimp or they won't always go bang. Let me know if you have questions.