I view the need for such as entirely manufactured.

A good quality double rifle is a hunting rifle, period. Used for that purpose, like any other hunting arm, they'll get the full monty. That's what they're for, and they're especially well designed for it. I find them much more resistant to weather than other action types. Stainless and plastic won't make them work any better, or any easier to maintain.

For my bear and elk hunting, I use a pre-war British medium bore boxlock double rifle. It's been through countless thunderstorms, snow and ice, dust, and mud. It gets wet - a LOT. When it does, I wipe it down at the end of the day, and run a patch down the bores. It's then ready for the next day's hunt. When I get home, I clean it thoroughly (not a strip and clean though), clean and oil the bores, and put it in the safe. Nowhere near as much trouble as a bolt rifle. Nice not having to worry about the inside. I have a full strip and clean done every 5 to 6 years on average. I just had one done after 7 years. Remembering a hunt through 6 straight days of heavy rain a month after the last one was done, I watched over my gunmaker's shoulder as he pulled it apart. It remains as pristine inside as they day it was made.

Sure, they'll get a few work marks. I put a nice scratch in the stock some years ago when I went end over end down a mountain with it tucked in my gut (where I bear hunt is pretty much veritcal country). You gonna hunt, or look at your gun?