I'm playing 716 AP2s with R300 shafts.  I'm looking at a set of T200s, one set has S300 shafts and the other has Project X 6.0. I'm not sure what my swing speed is but my 150 yard club is generally a 7 iron.
Assuming I don't have a stiff shaft swing speed or are maybe on the line between the two.  What would be the impact of hitting the clubs with the stiffer shaft?
Thanks,
Robert