Do you cam over? You know set the die 1/4 turn more after it hitting the shellholder?

After you fire and eject the shell, could you put the shell back in and chamber it?

If you can't then your chamber is slopped up. Now if your just concerned cause your case isn't perfectly flat, don't worry about it. In all honesty, however, near the rim of the case should exceed .004" of that caliber after firing compared to it before.