That looks sketchy to me, but without having the case in hand for inspection it's hard to say. How many times have these cases been reloaded, and with what type of loads?

Make a tool out of wire to inspect the inside of the case. Basically a length long enough to reach down in the case, and curved slightly on one end. Slide the end along the inside of the case where that mark is, and see if you feel a valley. If so, that is almost surely eminent case head separation.