I came across the following via a link from Alan Stewart's excellent Camelet in Four Colors website. He also links to a lengthy interview on Comic Book Resources. From Radical Publishing, Caliber: First Canon of Justice (2008), written by Sam Sarkar and illustrated by Garrie Gastonny, is a recasting of the Arthurian legend in the American Old West. It was originally published in five issues and later collected into both a hardcover and paperback edition. There are links to further interviews (under "News/Reviews") at Radical's site for the series.
The Arthurian Legend of Excalibur is reborn in the Old Pacific Northwest. A world in which Shamans replace Wizards, gunfighters walk where knights once stood, and in which a mystical gun will change the world in place of the sword of legend. It is here that Caliber is revealed as a tattooed six gun imbued with supernatural power. A land where lawlessness runs rampant, and Arthur will have his chance to set balance to the scales of justice.