When the ball leaves the barrel of a smoothbore it will most likely be the same as this barrel, a " nuckleball" . However what is not being able to be controlled is the slight casting imperfections. Each shot could be slightly different due to the uniformity of the ball being different, thus having different pressures going down the barrel, results in a slight "curve" ball. The straight rifling, to me, will help keep each shot more uniform as it expands and locks into the rifling groves. Sounds plausible to me.