Can Mr. Schrader get his record expunged?
He can ask.
Keep in mind, this isn't just the court ruling (which is obnoxious), but there is a federal prosecutor on the other side, pushing the argument that this man is not fit to possesses a firearm.
There are literally hundreds of cases like this, and quite a few where the courts beclown themselves. They get away with it because they have the power.
I am of the firm view that the federal courts are deliberately intellectually corrupt when it comes to the RKBA. Unfaithful to the law, etc.