Depends on how many rounds were fired, action screw torque and the fit of your action to the bedding block. I always glass bed whether there is a bedding block or not. Having had (and still have) 3 or 4 B&C stocks with blocks I have found them to be a tad on the loose side. Try some Sharpie on the block behind the recoil lug and under the action where the scuffs are and shoot some rounds to see where your recoil lug is bearing (or not).
Yes these contact marks are common with non bedded factory rifles...Dusty gives some good advice here ^^^Those are the only places it touches. A good example of how much bedding is needed on any stock regardless of what the mfr says