well i use winchester in my 308 for target shooting, and get under 1/2 moa performace, most of the time more like 0.3moa, but to do that i took about 350 cases, fired them all in my rifle, neck sized them all, debured all the flashholes, trimmed them all to the same length, and then sorted them all using a scale accurate to 0.1 mg, i now have batches of 50 that have less then 0.5 grains difference in the extreams, and standard deviations of less then 0.2 grains, i have been very happy with these cases so far, but it was a fair bit of work to get there