Down in the top of your die you should have a bushing that looks like this
that bushing will size the outside of the neck DOWN to the dimension on the bushing. Then the expander comes back up through the neck to expand the neck to the expander ball dimension, in your case .282"
BUT if the bushing is not small enough to size the neck down small enough, the expander will not even size the neck
Get a smaller bushing
BTW, you also have to allow for springback on the neck and varying thickness of your brass. For instance if you had a .312" bushing, the OUTSIDE of the neck will be sized inward to .312" and then may springback to .3125" after. On the neck thickness, if you had a case that had thinner neck walls, then the bushing will not size the INSIDE diameter as small as your other cases.
Most reloaders using bushing dies do not leave the expander in. They will outside neck turn for consistent neck brass thickness and do the math to get the ID they want without the expander.