I'm shooting 125 gr. Montecs and 125 gr. field points, but I have experimented with muzzy 115 gr. 4 blades as well. I can get the broadheads to group pretty well, but the point of impact is always different with the drop away, but with the prong rest, they are identical. It's weird, but I have run into this once before...can't remember exactly what bow it was then, but a similar scenario with the drop away. I have probably spent more than 12 hours playing with the drop aways to try to get them to shoot broadheads and fieldpoints the same. I have tried my trophy taker, and a cobra diamondback. I have even attached the diamondback cable to the cable slide to see if it made any difference, but it didn't.