Full disclosure from a personal experience. I had a 7mm RM built by earlier said gunsmith. It was giving me fits. No idea why, but with a 180 Berger and H1000 I had a load that was an ES of 7. Couldn't make it hold a group better then a paper plate at 600 but would shoot 1/2" at 100. I switched to 168 Bergers with H4831. ES was 16 but would do half MOA at 600 pretty consistent. But it bugged the crap out of me that my ES was double the ES of the other load. Spent some time talking with the gunsmith and then he asked me why I was chasing ES. 600 Yds is what I had built the rifle for as it was a sub 7lb rifle and I had other rifles to shoot farther. I did kill a deer at 1056yds with it on a perfect condition morning cold bore shot. I know there were other variables then just the ES. I also decided that with all the info out there from this forum as well as others I could find a pretty good idea where velocity was going to be to put into the ballistic calculator. After a group at 750-800yds I could tweak my velocity in the calculator pretty darn close. Shoot a couple more groups at 500 and a couple more pushing 1000 and drop charts were pretty much verified. So, I got rid of the chronograph. The one time I couldn't get it to match was because the BC for 300 grain Berger was wrong. I also don't sort brass. I will shoot a lot, if I get a weird flyer, I'll mark that case and load again. If it is a flyer again it gets tossed out. I cull arrows the same way. Love this forum to learn and try new things. I have a buddy who doesn't hunt, just shoots for fun and is trying to learn the long distance game. His shooting range goes to 600. I'm teaching him to do all the things I don't do so he can learn for himself what makes a difference and what doesn't for him. He's turning necks and keeping data. So far not much difference as he's already starting with good brass, but now he knows. He's weighing and sorting brass and comparing loads, so far not enough difference at 600yds. He's tried to run ladders and ended up more confused then when he started. He's bought the Applied Ballistics book and read it. He'll call me up and talk to me and I always tell him to go try it so he knows. What he's learning(it took a couple of years, while I waited patiently for him to get there) is that he is the biggest variable. I told him in order to overcome that, he needs a lot more trigger time. Bryan Litz said it best, if your missing because of reasons that aren't ES then reducing ES isn't going to fix it. Love this thread, hope the OP finds the magic load and goes and shoots his barrel out so he can start over and learn more.