Fellas, I have a Browning 257 Roberts Micro Feather Lite with 20" barrel. I'm not sure of the twist rate in the barrel but I've tried 110gr Accubonds and 115gr Ballistic a Tips with no luck with groups. I've been able to get two rounds touching then 3" flyer usually high to the right. The powders I have used are IMR4064, IMR4350, and H4350. I have tried various amounts of powder and different seating depths. Rings and bases have been checked. This the only rifle in my collection I have not been able to figure out. Any suggestions would be greatly appreciated.