In a 700 the ejector is going to press the case toward the opposite side of the chamber so you get a little more expansion on one side. It’s common to see that asymmetry on fired cases.
I can't say I've ever noticed that in the 20 or so Remington 700's I've owned. The only rifle in my possession where it's clearly noticeable is a control feed Winchester M70 classic in .270WSM.
