I have had that issue in the past as well. It wasn't that. I took it back today and the store gunsmith thinks it's the extractor. They are gonna get it fixed.One thing to check is to see if the front action screw is a bit proud into the chamber. I had a factory Bergara that had that issue. 10 seconds with a grinding wheel and I was good to go. It was very subtle - I had checked the chamber with a flashlight and hadn't noticed, but it was clear from the bore scope it was proud.
Try turning out the front action screw by one full turn and try to chamber a round. If it works - then you just have a screwed-up scope mount to deal with. If it doesn't then you are only out 1 minute of your life.