First off your description of "normal Hornady junk brass" is way off base. Hornady brass is excellent brass. Been using it in .308, .243 and 6.5 Creedmoor for years. Your brass prep is stuff people do to even Lapua brass.
As to the question, Grump got it right.
I wouldn't say that Hornady is excellent brass. I would say Lapua is excellent brass.
If it were excellent it wouldn't have come half polished and half anealed. It also wouldn't have a weight difference of almost 9 grains in a lot of 50. It wouldn't have a .09 diffence in length in a lot of 50.