John Linebaugh (gunsmith) also produces great information resources from many years of experience. The following is one of his more well known articles, but there are more on the site. Both men have been long acquainted with the work of Elmer Keith, BTW, while doing much of their own work since.
Gun Notes: The .45 Colt - Dissolving the Myth, Discovering the Legend
by John Linebaugh
http://www.customsixguns.com/writings/dissolving_the_myth.htm
Familiar with the Linebaugh .475 since Ross Seyfreid wrote about it in the 80’s. Never had the nerve to touch one off though.