Need some help on what to try next to reduce vertical with the 90's at 1k. I shot a two day match this weekend and dropped at least 25 points to vertical each day. My best string was a 193 5x and I had 7 shots drop just low of the 10 ring all of which were in a fist size group. We were shooting on a target cam system that gives your at target velocity and all of the low and high shots for the 2 days were 25+ fps different that the 10's and X's. Shooting over the chrony during load development I have a 15fps ES with a sd of 7 and a 100 yard 5 group in the zero's to .2's. As far as I've tested was 300 when zeroing for the match and covered 7 shots with a quarter with the same load. I thought that it might be internal volume inconsistencies that were causing the fps issues and high and low shots. I took a screen shot of the target cam which had each bullet impact numbered and kept all my ammo in the order in which it was fired. When I got home, I pulled the high and low shot brass and weighed the cases for internal volume of water. What I found was there was .3gr total dispersion of all the 9's shot during the 2 day match. Some bullets that impacted 18" vertically from another on the same string had identical case weight and internal capacity. Before the match all brass was weight sorted. All loads were charged on Fx-120i scale that measures to the kernel, and all bullets were seated on a Hydro Press and were within 4lbs of seating force and base to ogive of loaded rounds measured to within .001. The match was as calm for two days on the first two strings as one could ever ask for with a 0-3mp wind from right to left, I dropped only a few points horizontally. One thing I did find was that the strings with 22-26lb seating force grouped considerably tighter vertically than the 16-20lb strings but I still dropped 7+ shots out of 20 to vertical on those. This is a target I shot, the brass from 10 and 1 were identical. Shots 2,16,17,18 all impacted just low and had identical velocities. Any ideas on what to try next.
