Hunting Net has videos available. They are priced fairly, and they ship quickly. One especially stands out as being useful to newbys and seasoned shooters, and that is, Roger Raglin's, Black Powder Magic
Another one that shows the power capable of being generated by a muzzleloader is Roger Raglin's, Dark Continet-Black Smoke. The dropping of a charging 50" cape buffalo less than three feet from two camera men, is worth the price of the video alone.