Possibly. I know I gave up on getting my 9mm PCC down to the lower end of USPSA minor power factor with it's 16" barrel. But it's a different animal running mucho faster powder in my gamer loads than a .357 Magnum uses so I'm pretty skeptical. I've heard stories about how the powder is all burned in 3-5" of barrel on those loads. Extrapolating that out to factory .357 loads would probably end up at 14-16" maybe? So if the stories are true it would make some sense. But I'm not totally convinced either way.Man, according to Ballistics by the Inch, it appears going beyond 16" and the bullet is slowing down some? Am I reading this right?
http://www.ballisticsbytheinch.com/357mag.html