Myself and my friends have taken bear with Spitfires. From 150 lbs to 415 lbs. They do the job very well if hit in the right spot.

Just a thought though, my group which was loyal for years to Spitfires is starting to look at different heads. The only real reason is a few of us have buried the head in the far shoulder and didn't get an exit wound. As the animal ran off the arrow backed out a few inches essentialy covering the entire cutting surface, not allowing any additional cutting to occur. We did recover these animals, but a fixed blade in the same situation continues to inflict serious damage in the vitals as the arrow bounces around or slides out. With Spitfires once it backs up a few inches it becomes as dangerous as a field point in there. On the perfect hits this doesn't matter, but on a marginal hit, that extra damage could be the difference between a recovered or lost animal.