I don't know about others, but I load them like I'm going to be be shooting 600 yards. For a fast 7mm, that's exceptionally important.
I just did a little figuring along this line. I picked the 7mm Rem mag since it's a common fast 7mm. I looked at published data for 150 and 160 grain bullets for a couple of typical powders. I found the velocity increment per grain of charge to be close to 50 fps/grain. Let's assume a 0.6 grain charge spread, +/- 0.3 grains on either side of whatever is optimum. This would account for 30 fps high to low. Running a 0.5 G1 BC at 3000 fps and 3030 fps through the basic Hornady calculator set to a 300 yard zero shows 1.1" of difference in drop at 600 yards.
