swap bbls.
I remember reading years ago that different era S&W's had slightly different barrel threads, so swapping barrels among certain ones was a one-way deal. You could do it, but once done it was nearly impossible to reverse. You might want to check that out and think about it. Other than that, heck yeah. If you want a shorter barrel then by all means!
* Now that I think about it, I believe it was talking about the threads on a "pinned" barrel and a post-pinned barrel. They are different. If I remember correctly.