S&W 340PD titanium cylinder issues?
I'm looking at buying a used S&W 340PD it has the titanium cylinder,I've heard about something called cylinder erosion with these guns. What it this exactly and what causes it? Does it have anything to do with the "no less than 120GR bullet" warning printed on the barrel? By the way its like new in box condition and also has the crimson trace 405's on it and they're asking $600,I know this is great deal for this gun but I'm worried about the Titanium cylinder giving my issues,thanks for any help.