475 grains total from either my Kanati or my RER XR. That's just over 10 grains per pound of draw at my 28" draw. My usual broadhead is a Zwickey Delta, but I've got some Simmons Tigersharks of the same weight that I'm going to give a go. These arrows travel at 175 to 185 fps from those bows respectively.
They make whitetails dead, which is really all I ask of them, LOL! Oh, and it doesn't take them long to get that way either.
I've tried heavier than 10 gpp, but really can't say that it made a difference. I have no desire to go lighter. My setup tunes to perfection, which is what I'm after.