Thanks for the report 5-shot. Man - you have done a lot of testing on Magnus two blades lately. I have tried these 100 grain heads, but wasn't happy with the noise they make in flight. I tried them with my light carbon arrows last year and wasn't completely happy with them (BTW I switched to Muzzy 75 grain last year with that setup). This year I'm sticking with my aluminum arrows and my 145 grain Stos (made by Magnus) two bladed head. I hate braging (really I do), but I was able to shoot a 1 1/2 inch group over this past weekend at 30 yards with this setup. Slow - maybe, Deadly - absolutely!