How far does a non rifled cannon fire vs a rifled?
Even though it's possible that a rifled gun will shoot further
than a smooth bored gun; that would certainly be the exception
rather than the rule.
Generally speaking, the rifling is for accuracy...not range.
And, generally speaking, a smooth bore would shoot further than
a rifled gun; because it has less friction than a rifled gun does.
That's why the M1 Abram MBT has a 120mm smoothbore; to obtain more
velocity. To compensate for it's loss of accuracy, due to a lack of
rifling; the M1 tank fires projectiles which un-folds fins upon
exiting the muzzle.