ran across this article, very informative part about turning a barrel to correct windage on a gp.
http://www.thesixgunjournal.net/repatriatedrugergp.html
Another good article about the 3" gp here:
http://www.hipowersandhandguns.com/Range Evaluation - Ruger GP100.htm
http://www.thesixgunjournal.net/repatriatedrugergp.html
Another good article about the 3" gp here:
http://www.hipowersandhandguns.com/Range Evaluation - Ruger GP100.htm