Black Hills may be a big part of the reason there's no factory Winchester component brass around... couple that with the regular Winchester ammo being produced, and there's just nothing left over to sell as component. I did find recently that Midway had some 270 Winchester brass (Winchester headstamp) once again. After shipping, 50 cases were going to be close to 40 bucks, and I didn't need a whole lot of the stuff... so I didn't take the bait. Rather, I found Winchester silver box Power Point 270 at Walmart, for 19.97 a box of 20. For 40 dollars, I have 40 completed rounds (and they do shoot more than well enough for hunting and of course practice), and I've got the brass left over.
Many folks gave up the hunt for 300 WM brass in recent months (I know a smattering of it has shown up here and there in the last couple weeks)... so buying factory ammo and shooting it up, or dismantling it and dumping the powder and re-purposing the bullets has gotten to be a more common practice than it ever used to be... :/
Dan