Thread: New to reloading problem

So first of all i am new to reloading. The problem i am having is that when i go to resize the brass i can't tell if its resized or not because when i take a projectile
and put it into one of the not sized cases it is hard to get it. I thought once you fired a round the neck expands and if you were to take a projectile of that calibre it should not even touch the neck. Can someone please explain?