I too am having some problems with horizontal stringing. I am shooting a 7mm Rem Mag with the 160 Nosler Accubond. I have tried varying the powder charge and the seating depth. I am pretty happy with the load I have come up with (8 groups averaging 0.85 MOA- 3 of those groups were at 400 yards) but the larger groups are due to a shot off to the left or right. I was surprised by a comment on a different post that seating depth can have an affect on horizontal stringing. I had thought that powder charge and seating depth mainly affected vertical and that horizontal was mainly wind or gun handling or parallax. So far it seems that my gun is shooting this bullet best at touching the lands or 0.010" into the lands. Same basic accuracy at both. I have tried 0.010, 0.020, 0.025, 0.030, and 0.040" off the lands also. I have not tried 0.020" into the lands though. Maybe that would be even better? I did seat a bullet long (0.030" into the lands) and chambered the round just to see if the bullet would be pushed back into the case neck. It did not move. Neck tension must be farely high. I am using an RCBS competition full length sizing die, not the Redding bushing dies. Do you think there would be any point in trying 0.020 or 0.030" into the lands? Rufous.