All within an hour of Triple B Clays:
Moore N Moore in Sylmar - great course and even greater people.
Oak Tree Gun Club in Santa Clarita - one of the most beautiful and scenic SC courses in the country, even if it is a bit of a pain to be trucked to the starting station.
Rehaauge's in Chino Hills - pretty much a flat course, but well located and easy to get to.
Redlands Shooting Park in Redlands - more focused on trap and skeet, but a decent SC course that is also pretty much flat.
More detailed info at
http://www.claytargetsonline.com/
or here
http://www.socalclays.com/southern-cali ... ranges.php