project x 6.0 iron shafts

Stiffness wise near to the x100 but play very differently. Feel and ball flight are totally different, X100 has a better feel and gives a lower trajectory, I also feel that the x100 spins less.
 
I usually play my Titleist AP2's with Project X 5.5 but the combo Mizzys I bought have Project X 6.0 and they go straighter and maybe a little longer
 
i have them in my mizuno mp52's. i stumbled upon them by accident but absolutly love them. i have two vokeys winging their way to me with those shafts. they feel fantastic.
 
As I understand it, FCM is a way of measuring shaft flex based on frequency.

You put the shaft in a machine that holds it at one end, and twang the other end. The machine measures the frequency of oscillations.


I remember Ethan saying before that S300 play about 5.3 on the PX scale (the PX one, not the other one that is half a flex softer). Having said that, I've gone from S300 to PX6.0 and they don't feel any stiffer to swing to me. It might have something to do with the extra weight of the S300, but I'm only guessing.
 
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