Not really westerns, although they are set on what was the western border at the time about which they were written, are James Fennimore Cooper's books. "Last of the Mohicans" is my favorite, but all of them are good reads.
Read them in grade school. 12 or 13 years old I thought I was Hawkeye / Pathfinder killing squirrels behind the house. I have them on kindle now.
