If I was buying some 300WM brass (which I probably will be) I would check these guys out. Great reviews and supposed to be very consistent.
http://www.atlasdg.com/index.cfm/ID/2/BrassCartridgeCases/
I’ve been in pretty much the same struggle. I just ordered a 3-15X50 NXS. I didn’t want to put a rail on this particular gun and with 34MM rings that’s about the only choice. I also didn’t see enough to justify moving up to the ATACR over the NXS.
Watch Camofire. They usually have the Ovis elk set on there. I’ve used mine for three elk now and they clean up good as new. The drawstrings are tough and they seem to work as good as any.