Tony, I recently called S&W and asked the same question. The gun is truly rated for +P if it is a -3. This can be found on the inside of the crane as: 38-3. Serial #'s begin CCCxxxx. This is supposedly the J "magnum" frame, but I don't know what that "magnum" designation really means. Still the best bet is to practice with non+p's for longevity sake. Best.