I also had the same issue, I put Dawson adj sight with the 305 frt, work perfect but really didn't like the height of the frt. I really like Scott Warren's rear sight so I tried that. I used the 180 frt and it shot low I had a 160 tried that and it shot high. I had Dawson make a 170 FO and it is perfect. I use a 147gr MG cmj with 3.5 gr of TG PF of about 135