Muzzyman, maybe it was the shots taken, angle placement, etc. but I've used 125 grain MX-3 several times with little damage to the blades while it seems I've had more damage to the ST blades. I still have a few ST Magnums on hand and would not hesitate to use them though. Both fly very well for me with my setup. I am going to play around with some Muzzy Phantom SC 125 heads this year. I like the thought of .50 blade thickness.