Which is why I asked if others have data points to add.
That the Lapua fell right in line with the Gov't case and the Commercial Win case gave me hope there might be reasonable linearity as long we're dealing w/ "common" brass. (Anyone have a Federal case to test that theory?)
As FrankenMauser has noted in the past, brass manufacturing is distributed all over the place.
http://thefiringline.com/forums/show...5&postcount=15
So I am curious as to how well the linearity holds up