I just started using Spitfires this year, and I'm amazed at how well they work. Ok, I know someone will have something to say about this one, but I shot a doe at 60yds, and the spitfire shattered 2 ribs in and 2 ribs out, and still buried in the ground about3-4 in. Also, I had one blow through the upper leg bone on a doe! I'm sold now.