i used 4 bladed muzzy's for years and liked them very much but the fellow who owns our local pro shop ( a former national champion) gave me a 75 grain premier from rocky mountain. I never had a fixed blade fly so true. I arrowed a 140 class buck with them in Illinois last season and the heads proformed nicely. I know you can't judge a head by one deer but the tight groups out to 40 yards convinced me.