I shoot the 60-75's with 125 grain heads cut to 30 inches out of a 70 pound bow. I love them. They give a very good ballance between being fast and are heavy enough to keep the bow quiet and increase the momentum of the arrow a good bit. Mine weigh in at 490 grains with feathers and about 515 with quick spins (guessing).

IMO one of the best carbons made right now. At least of the ones I have tried.