Check out buying the Western Horseman books Legends. They are up to I believe 8 now? But look for the ones that have the Gunsmoke horses, may be in 2 or 3.
But you can also go to Youtube and type in Gunner and see all sorts of horses with this bloodline in reining, in fact just saw one from 2000 I believe? Or '01.
But the Legends books are well worth having in your library, as they have the most influential stallions and mares in the Quarter Horses starting back at the beginning. Lots of photos, and lots of information.