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Hello, Maybe I can share with you my feeling... I have MP60 irons with shaft DG S200, R300 and NSPRO 950GH flex-SR , 3 sets... I've change the shaft from NS-PRO 950GH flex-SR to K's 3001 flex-S recently, I feel it strong than NSPRO and stable, like DG , but it weight is very thin than DG , and it can speed up the swing... my clubs swing weight is D0-D1, I'm very like the response when it impact the ball and it's style ! about Rifle , I've been try "project X 5.5"...it's too hard for me... K's 3001 ,suggest you can try it ! just for you refrence, Tks! PS:I'm very like re-shaft , my driver change Mamiya AVIX 6066 already... feel so good!