So I formed some brass tonight and without checking the inside diameter of the neck I went to seat a bullet and I pushed the neck of the brass back into the brass case. I then measured the inside diameter and they are to small. What could I have done wrong in order to get then neck size wrong and what is it supposed to be? How do I change it and get the brass I’ve sized back to the correct inside diameter? What tips do you gentlemen have for this newbie in sizing this brass down?