Yes, the powder residue is normal. It shouldn't be there after fireforming though or your sizing to much. Keep doing what your doing to fireform. I usually use up partial cans or compatible powder to fireform with instead of using up the lot# I intend to do accuracy work with. You can fill it up to the base of the bullet, zero and kill varmits pretty well if you wish. In my BR guns, I just blow them into the hill side.
Hovis