My Peterson brass came in the mail, along with my dies. I did some measurements and I'm thoroughly impressed!
Almost all neck thickness was 0.017, hardly ever more than an ES of 0.0005 on thickness.
Neck run-out was almost always immeasurable, but 0.00025 if I had to guess.
Didn't do weight.
Length was less consistent, as it always is. Most were around 2.164, with about 30% being 2.160.
I did some neck expanding with my Lyman neck expander die.... it's awesome. It didn't induce any runout. Zilch.
After expanding the necks, it seemed most were about .0165 in thickness.
I'm not sure why so many people shoot Lapua. For about the same price, at least with this .284win brass, the quality, and the fact that it's US made, it seems as though it's a hard deal to beat!