The first thing I would suggest is. Take the bolt out of the rifle, clean the recess in the bolt, And make sure the ejector pin is sliding into the bolt flush with the bolt face. Then see if you can hook the rim on the case with the extractor and get the case to fit solid to the bolt face and line up with the bolt. If it does, Put the bolt in the rifle and through the ejection port hook the case on the extractor and carefully guide the shell into the chamber and try to close the bolt to battery. If the rifle does close then it is an extractor problem. If the bolt does not close into battery there is something about the chamber haunting this rifle, May have to have the chamber reamed a little deeper. Good Luck
I just did this this morning and the bolt closed fine so it's obviously that extractor. I contacted Remington yesterday and they sent me an email with a service ticket number and a note saying that I should receive an initial response shortly, but I haven't received it yet.