I would avoid the all aluminum rimfire "Dina" adapter. Accuracy even @15 yards is poor. I could not even hit a popcan at this distance. I was using an iron sighted slug gun.
I have no experience with the Walther variants, but I suspect they are a bit better than the one Dina I used. I once had a long all steel sub-calibre adapter for 38/357 for a hinge action 20 gauge & it was okay at 35 yards or so accuracy wise. It was head & shoulders better than the short rimfire adapter for sure.
There used to be a California based company that made a 38 Special adapter ("Cherry adapter") for 12 gauge, specifically aimed at LEO training. I have no idea if this outfit is still around.
I think myself, with any adapter made short enough to feed & eject from a repeating shotgun, I think hunting accuracy will almost always be hard to attain.