From the Badlands

Sam Merchantson rode into the Badlands trying to lose a posse. He should have died, but his luck was in, and the sensors were out. Sam lived in a world of cattle-rustling and muzzle-loading pistols.
But it hadn't always been that way. Once it had been a colony world, filled with the fruits of advanced technology . . . then the enemy came. They got most of the colonists and almost all the tech.
There will be new things coming into the world when Sam returns. He'll bring medicines and machines, history and hope, fear and freedom and-like it or not-he'll be bringing WAR!
When he returns From the Badlands. Porky is a riding pig created by genetic engineering.
The world is a lost colony where the possession of unlicensed technology is both a crime and a sin.
Sam is a cowboy and sometimes outlaw. He was born back east on the coast where he was the child of a household maid and unknown father. He was about the same age as the heir to the "barony" and was made companion to the heir. So Sam is educated by the standards of the time.