The only two answers for across the course are to either 1. Get good brass that you use for every yard line. I like this option because I save time reloading. (Contrary to popular belief...Lake City brass is pretty good...especially the 5.56 brass. I know when I used to shoot for the Army, our 600 yard loads used Lake City cases with a different primer. They might have been a little bit above average if they all came off the same machine, or as part of the same lot...but I never cared to look into it. We also shot a lot of the Black Hills 77 gr ammo at 600 as well, and there is no reason you can't score in the high 190s with it, but it's just not as forgiving on the wind. 2. Get good enough ammo for the 200,300 yard lines, and save your premium stuff for the 600 yard line. Lots of people do some variation of this, where they will shoot Lake City brass at the short range stuff, and then break out the Lapua for the 600 yard line. If I were going to do it again, I would just get Lake City Brass if I was shooting Service Rifle. If I was shooting a match rifle, I would probably do some form of 6BR/6XC/6.5 Lapua in a bolt action, and just suck it up and buy 500 pieces of Lapua, Alpha, or Peterson brass. I remember being told that Lapua brass is intended to last 10 firings without being annealed again, so that means 500 pieces will get you 5000 rounds before you have to think about getting new brass. I think the National Championship is 3 80 Shot matches plus sighters, which works out to around 250 rounds, and throw in a team match or two, and 500 pieces should be plenty. I went down the neck turning rabbit hole with 260 Remington. I thought I was going to neck down 308 brass and neck turn it...I got through 50 rounds before deciding it was a waste of time. Until someone comes up with a neck turner that is like an electric pencil sharpener I am not ever going to bother with it.