On Thu, 08 Sep 2005 18:10:29 +0000, T.Alan Kraus wrote:

A well used revolver will develop cylinder gaps that are of the order
you mention. The usual recourse is to remove the barrel, and if screwed
in, add threads, so that you can close the cylinder gap to .005 -. 010.

Do you know specifically what part(s) wear to cause this increased gap?
Moving the barrel back to compensate doesn't sound like the best fix
if the wear is in the cylinder somewhere.

Thanks, from a curious armchair gunsmith.