i attended the delaware bow hunting class, it just kept repeating itself about a broad head cannot be sharp enough. did the surjical tube thing. the idea is to sever main vessels for a clean kill. it may be so that if you cut your finger with a razor blade you won' t bleed much but animals are running and not letting the incision start the healing process.

may be overkill but i shoot my spit fires once and then replace blades.