I'm trying to locate an old scifi book I last read in the 80's that was written in a style similar to that of H. Beam Piper.
It is the story of a young man living on a planet that was used as a prison planet prior to the breakup of the federation after a long war. He and his friends gain access to an interplanetary ship and go hunting what was left of civilisation.
Eventually he discovers he's being helped by a member of the police force that stayed behind to help people leave when the time was right. He also finds out that there is a second planet in the solar system that used to be a resort planet and goes there.
The story ends with him about to leave on hyperdrive ship to go out and see what's happened to other planets in the federation.
This is not the story "Coventry" by Heinlein, despite the name and similar overall theme.