Not a bad idea! You know, Arcticap posted that one guy's results of such a test, where 4fg didn't always produce the top velocities, but I got to thinking. That was just one guy, one test. Results could be completely reversed on a different day, different guy, different lots of powder, different loading procedure, different temperature, different guns, wads, humidity, phase of the moon, and so on. Once upon a time, I chronographed my Ruger Security Six .357. Stubby 3.5" barrel. Then, same day, within the same hour, did the same with a S&W revolver with a six inch barrel. Same load, same cartridges out of the same box. The S&W was only 25fps, on average, faster than the Ruger. So, really can't come to any solid conclusions with limited testing, or one man's test. One couldn't say that a six inch revolver barrel is only 25fps faster than a three inch, based on that. So any real testing would have to be fairly extensive.