I don't shoot much .40 but I'm starting too. Noticed a LOT of muzzle flash today with 165gr PMC and 180gr S&B. This was from a 4.25" barrel so it wasn't because of a short barrel. I've never particularily noticed flash before during the rare times I've shot .40 but maybe I just don't remember. Typical of .40 in general or was it just these two ammo brands?