In theory, yes. In practice, well, you will soon see.

Europeans often suffer restrictions on what kind and how many guns they can own, along with similar restrictions on ammunition forms. Other opinions differ, but, combination guns, to me, always seem to be the worst kind of compromise. Firing a 16 gauge slug out of that gun wouldnt be a pleasant experience, and the straight stock, light weight, and single bead sight arent going to help matters, with regard to accuracy.

Id be very interested in seeing your results, on paper, with your gun. Unstabilized
round balls have never impressed me as far as accuracy was concerned (they do, in normal shotgun bore sizing, hit like a ton of bricks, however) but, Id be willing to bet that the non rifled barrel actually is more accurate with rifled slugs, then the rifled barrel is with pumpkin ball slugs. Ditto the results with bird shot in the rifled barrel. It would be pleasant, in this case, to be proven wrong.

Love to see those results as well.

Let us know.

Best,
Ted