Sam,
I don't know for sure what was causing your feed problems, but my Montana (7mm-08) was a little sticky on feeding when I first got it. (bought at about the same time as yours). I opened up the back half of the feed lips by about .005" and then polished the inside edges with 400 grit. No problems since. However, sounds like you found another fix. May be better in the long run than what I did to mine.
