They aren't grouping at all! If I had any kind of pattern I could just move the sights, but these things are all over the place. I did spin test them all but one looked good. No "O" rings here they are 100gr. 3 blade Muzzy. Bolts are Easton XX75 2216's. At first I thought it was just me, I marked the string to make sure I'm drawing it back correctly. I normally sight in offhand, with this problem I put it on a rest, just to prove it's not the shooter. After having a problem with the safty and taking the Horton back I ended up with a Parker. However the b-heads are still shooting the same. So I've figured that I either need smaller b-heads or heavier bolts. Which do you all think would be better?