Chris09 and Sonoran Silkies thanks for the info! I didn't realize there was such a variation in feeds with similar names. The feed available around here all seems to track very closely (if not exactly!) with the Purina feeds.
There are very few nationwide brands; most have a relatively local distribution. (Notice I said relatively; Hi-Pro is milled in west Texas, which is not exactly a hop skip and jump from here, but it's not nearly as far as it is to Kansas or Washington or ...)