McGowen were the only folks offering something like Dodecagon, wanted something interesting to look at barrel profile wise and it was $5000 for the barrel I wanted, integral quarter rib, tapered octagon, integral sling stud and front sight etc. I realised I shoot out barrels and there was little point, the McGowen was $650'ish and looks almost as neat to my eye. I have a Krieger too but for a light barreled hunting rifle they'll shoot the same. Gets to the point of diminishing returns on barrel quality in a hunting barrel as McGowen even not being Krieger is better than any factory barrel, will save the Krieger for a long range rig.
20" is just to keep it handy, I go in and out of aircraft, boats, and trucks with a rifle like that and it's sure nice to have a 20" barrel in your lap in the Land Cruiser.

7x57 doesn't gain a whole lot in a longer barrel either. I've been looking at various flooring finishes for weather proofing the stock, there are a slew of good options for sealing with extreme durability.