I'm member of other site read down to the post # 6 here is part of it.
I remember that in the early 90's, Mid Tompkins did some weight checking on the Palma brass that Winchester made. I believe that Bob Jensen loaded the ammo, which seem to shoot very well. I forget the precise weights, but Mid said it was the most uniform brass by weight that he had ever seen, and I think Mid knew about that sort of thing
this is pretty good site get some first hand information from some team members
Here something on the new bullet since Sierra isn't the only bullet now