i agree , im sure they will all kill a deer using my 30 inch 70 pound vectrix. my only concern is geting a really good accurate flyer and like you said i dont want to buy a bunch and try them, i want to buy one set only. everyone pretty much likes the muzzy so i think they will work and im thinking a 3 blade to have a better chance of pass through shots (if i ever see a deer lol)