Case BULDGES near the very very bottom of the case (from the unsupported area of the feed ramp) need a special tool from what I hear. As far as dings and bent openings, not a problem at all. My 30-06 almost always mashes the opening on the case a little flat on one side, but my neighbor still reloads them no problem.
I recently found that an SKS will fling them much more crazy than our 3AT's. They may hit you in the back, they may go feet behind you, they may go feet straight infront of you, they may go feet to either side. They go EVERYWHERE. We usually use steel cased stuff in that gun, the "brass" from it is almost impossible to find, cause it tends to be dark brown or tan anyway.