I have had good luck with Winchester in my 308s. I prefer to weight sort it and inspect it though. The AR 10 likes RP, Winchester, and LC long range match. Particularly LC 67, 81, and 85 match. Each brand requires that I adjust charge weight to get back on the accuracy node. For example, with AR comp which is very accurate in my gun, I have to drop .4 grains for RP, and 1.4 grains in LC match to get the exact same velocity and get back on the accuracy node. Case capacity varies substantially between these three brands. A load that is fine in Winchester, which has the most capacity, can be dangerous in LC or other mil brass. The LC match requires the most prep of the three but is extremely durable. I do like to turn the necks on them but just enough to true them up without removing a lot of material. I also anneal them. The good thing about LC Match is the primers are not crimped liked standard LC brass and generally the Match version has not been fired in a machine gun. With LC brass. I sort by standard vs match, production year, and weight. You can see that I like to tinker and I took this on as sort of an educational project.
I am sorting through a large pile of 30-06 and 270 brass right now for use in my 6.5-06 And 30-06 03-a3 plus I do some reduced recoil 30/06 loads for a couple of my friends children. I use RP brass for those. I'm planning to use the 270 brass for the 6.5 because it's less of a step down for resizing. Though you do have to trim more initially. The brass pile contains Winchester, Hornady, Federal, Remington, and a few military cases. All this brass has been collected over the past 30 years. Some of it is over 50 years old. The difference in case weight in the same caliber and headstamp can be an eye opener. The Hornady cases in 30/06 have been all over the map weight wise. 270 hornady cases have been somewhat the same as far as variance. This isn't a knock on Hornady as their brass from the same lots is pretty consistent. The variance is probably due to different year production. It also emphasizes the need to initially weigh cases. I decided to use the 30/06 brass other than RP mentioned above for the Springfield 03-a3.
In 270, Winchester has been fairly consistent at around 186 grains. But I have seen a few heavier and lighter. The Federal in 270 seems to fall into 2 different groups. Many more recent cases at 200 grains, and some apparently older cases at 180 grains. Probably due to a change over the years. I plan to use the Winchester 270 as first choice, the Federal 270 at 200 grains as second choice in the 6.5 And hold off for now on hornady and Remington. The gun seems to like the same load for both though the velocities differ slightly. Accuracy is identical. ES and SD identical. But experience tells me the federal primer pockets loosen up pretty quick and Winchester pockets hold up pretty well.
As you can see, all of this can get very involved and confusing. I'm just trying to make good use of the brass I have on hand. Plus, as I said before I like to tinker and experiment.
If that were not the case, I would pick one head stamp and if the gun liked my choice I would stick with it. In the more affordable category, Winchester would be first choice. If price wasn't a concern I would buy Lapua. Plus I understand Lapua is very durable and consistent. If it holds up anything like my LC match brass, the number of firings and reduced prep would make it a bargain in the long run.