There is a parallell thread elsewhere on the wheelgun forum about S&W imposing a 120 gr or lighter bullet limitation on their new 342, 337, 360, and 340 lightweight models. I'm at a loss to understand this. Physics would dictate that a HEAVIER slug would uncrimp more easily overcoming the heavy recoil on these lightweight guns. Some of the better defensive loads are indeed lighter than 120 grains. Let's hear your opinions on this one please.