Indeed it is. The most important lesson I learned around here is that you should always question conventional wisdom, but within the bounds of good sense.
I for one appreciate all the various opinions around here...I tend to learn more from the discussions where nobody quite agrees than I do the ones where everyone's on the same page!
To the OP: Don't you wish you could have showed him how you can not only shoot cast in modern rifles, but *GASP* in GLOCKS with their notorious rifling?