I was originally shooting beaman ics 400s and that was just a tad weak spined but tuned well for me. I switched to easton epic 340s a few weeks ago and there was no diffrence in tune at all. With the set up i have now the 340s are what i should be shooting according to the easton chart and shaft selector software. Cant figure it out but they shoot exactly the same. I went out to 50 and shot and there is only a tiny bit of diffrence maybe an inch if that to the point of impact. Guess this season i can shoot which ever i want.