I don't claim to be any kind of military expert, but I have played a few video games in my day. What if the accuracy was decreased (accounting for civilian survivors firing a military- grade weapon)? The way you described bullet paths in the OP suggests this kind of weapon would be better suited as an anti-vehicle weapon, as it would have more room to "tumble" inside a vehicle's inner workings. Lowered accuracy makes it harder to hit small survivors, and easier to hit large vehicles, assuming the shooter is at distance from their target (which they should be, as it is a scoped rifle). Or maybe I'm an idiot.