I shot the 115 gr. Muzzy 4 bladed broadheads for some time now and shot very good with them. This year I thought of switching to the Muzzy Phantoms. Well I shot the 125 gr Phantoms at 20 yards and they were all over the place. Put my 115 gr back on and cut fletchings. So my question is why are they flying all over the place and would going down to 100 gr help? I am shooting @ 70 lbs & 29" beman carbon hunter (400)arrows w/ 4"vanes. It's not like they are hitting in a different spot, which I would expect, they are all over. I shoot the 115 gr and field points @ 1" at 20yds. I will probably just end up sticking with the 115 gr 4 blades, but really thought it would be nice to shoot the phantoms. And yes my bow is tuned, I get it checked every year!