Hi, I am new to handguns and still have lots to learn so I apologize for this poorly worded (and perhaps ignorant) question. I own a 4" python and shoot both .357 and 38 loads. A friend of mine said there is a lot of unburned powder left over from a .357 load because the barrel is too short and doesn't allow enough time. He said, consequently, you really aren't getting much more "power" (for lack of a better word) from the .357 loads than from the 38's. Can anyone shed a little light on this? And perhaps compare it to a 6" barrel?