My Dad and I are developing a long range load for his new Bergara B14 in 6.5 CM. I’ve come trust using my chrono and using the ladder test system, it seems to get me very close quickly. He prepped a few rounds with fed 210gm primers ,H4350 and 140 Eldm bullets. I set up cardboard at 300 yards to catch the hits and he shot .3 grain increments through the chrono. I recorded velocities and found a flat area in the 39 grain area. We loaded 4 rounds at 39.1 to shoot a group at 100 yds because the wind was about 10 mph. It shot great with good chrono numbers. .77 moa with a sd of 7.5 at 2700 fps. I can’t wait for a calm day to shoot this at 300 yards! The thing that I can’t understand is, how can there be so little verticle variation on such a wide range of velocities? It doesn’t make any sense. I’ve only done ladder tests maybe 10 times , but there always have been changes in impact at 300 yds. Any ideas how this happens?