Tmoniz has it I believe. Too much headspace. While this is common for a hot round like a 7mm mag, it's rare for a rifle with so few shots through it. Basically what happens over time is that repeated firing of hot rounds wear out the throat of the chamber ever so slightly. You have a minute amount of dead space when the round is chambered. When you fire a new round the brass expands and fills the void. Then it gets hard to pull out. As to why this is happening with a somewhat virgin rifle, no idea. Call Browning Cust Service. Try other ammo too. You may have got an overly hot batch.