Red pine studs? Your mistaken as far as Potlach. Biewer still buys Red Pine and I would in no way, build another house out of Doug Fir. Worst crap there is for studs.
Potlach buys spruce, balsam, larch, jackpine as well as red pine. No northern Hemlock.
I understand that Biewer has switched to some off species also.
Potlatch studs are Jack Pine primarily. They might have a little Spruce or Balsam.
Their studs are not well thought of in the industry.
Spruce studs, White fir studs and Douglas Fir all sell for a premium to studs out of Potlatch.