But there's the rub. It's possible, but only if the bolt is fired from the barrel at relatively high velocity. Plus, you would still get yaw when the bolt rocket ignited out of the barrel, compromising its accuracy. As odd as it may sound, a smoothbore would be much more accurate if the muzzle velocity is low and the rocket ignites out of the barrel, as stated in the lore.
If you want to rationalize it, it's possible that only storm bolters are rifled (as shown in the 3rd Edition), to allow for increased penetrating power at very close ranges. Given the doctrine of terminators engaging at close range, this would make some sense.
Last edited by Dogbeard; 06-07-11 at 05:18 AM.