I went out on the weekend to check my long range dope as I had dropped my powder charge by a grain. Using 7mm rem mag, 72gr H1000, federal case, federal 215 primer, 168 berger Over the chrono the load had two velocity areas one from 3051-3058 and the other 3031 - 3037. At 300 yds the 3031 load shot consistently 2" lower than the 3058 load. Checking with my ballistic program the 20 fps difference should only have made 0.4" difference. The same pattern showed at 600 yds. I think the impact difference is more a barrel harmonics effect rather than just a velocity difference. When selecting this load 72 gr gave a vertical 0.8" group at 100 yds, 72.5gr gave a horizontal 1.5" group. I think I might try 72.25gr and see what happens. What do you think? Stu.