There is a vintage bolt-rifle belonging to a friend of mine in Darwin, that shows evidence of the rifling on the outside of the barrel. I have tried to get photos of this in the past, principly to end a long argument with 'Ray' over on AR a couple of years ago, but my friend is understandably reluctant as it might possibly upset a future sale.

The damage is not visible unless the barrels are held up to the light, but it is definitely there. I believe the rifle was already damaged before my mate acquired it.