I like lapua brass and have plenty of it in 308. Not that I have one anymore, but I have still managed to get 10mm groups with the crappiest brass you can imagine. Split necks and different types of brass amongst groups shot. Managed to get a 10 shot 10mm group with it. I used Lake City, Denver and Winchester brass and managed to get the group.
Brass quality is important but the rifle I reckon is more important. I thought that the quality and consistency of cases would give good groups. But I was mistaken.
I ended up going away from Lapua brass and used the lake city. Easier to resize and I got about 7 reloads out of the cases as well with limited to no effect on group.
That's what I found with the rifle and cases I used anyway. But as we know, every rifle is different.
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