That wasn't the answer I was looking for. I know full well how these barrels were rifled.
I asked if the lands and grooves were filed out at the muzzle, as some were, thus the appearance if the same as the interior of the bore
but filed larger to allow loading of a snug combination. If there was no relief crowning in effect, the gun would likely not produce any better
accuracy than a smoothbore (with no rifling) as a combination that would hold in the rifling would not be loadable.