This is a link to the posted summarized Ashby Reports. Read a few, it might teach you something.
Dr. Ed Ashby has invested 27 years in the study of arrow performance and broadhead lethality. His testing is the closest thing to the scientific method as is possible under the testing conditions. Never before has anyone tested arrow and broadheads on actual game animals on such a scale. The test results have been carefully compiled and are now available to the public free of charge. Bowhunters everywhere owe Dr. Ashby a debt of gratitude as he his data reveals which broadheads and arrows perform the best on game animals. The results show that whether you shoot a traditional bow like a recurve or a longbow, or if you're shooting a compound, the arrows and broadheads that performed well in the testing, will perform for you.