I assume that the project x 5.5 would be closer to a regular than a 6.0. I'm looking at some used mizuno mp 30's. Height and distance is definately a factor. I had a set of mp 52's, loved the feel and hit them really straight but could only hit a 5 iron 150 yards with project x 6.0 's. I have a set of wilson deep red 2's and hit the 7 iron 150 no problem. Can't work the ball with them and hit to many left, can't hit a knock down fade with the wilsons, but good height and distance. Any suggestions on which older mizuno's will work for distance ??? Maybe a set of mp 60's or 62's or possibly the 32's ??? I really would like to buy another set of Mizunos. I used to be about a 6 handicap 20 years ago with a set of mp 14's but lost too much ball height and distance with blades. Any suggestions would be appreciated !!!!