The Wicked West, Volume 1 by Todd Livingston, Robert Tinnell
The year is 1870, the place is the Texas frontier town of Javer's Tanks. Cotton Coleridge is a man running from his past. And being new in town, he's the one the locals blame when folks start dyin' mysteriously. By the time the truth gets out, half the town has died...and come back. Cotton's quick with a gun, but guns don't work on vampires!