I noticed on the PGCA 2012 raffle gun (10 ga hammer) the side plates retain much more CC than the action. Syracuse LC Smith's also age the same way, more color on the side plates versus the action. It must be the difference in steel and or the CC process. I have been told that the forging process modifies the grain of the metal resulting in some areas retaining cc better than others and some frames holding cc better than others. here is a Smith example of what I am talking about.
