I built my first rifle on a Stevens 200 SA and now I want to have you validate some lessons I think I learned along the way.

1.) I couldn't rebarrell to anything I wanted because it was a short action so it would seem that a long action would make a better platform.
2.) Not sure if I could rebarrell to a wsm being a small Shank.
3.) Hunting the PNW made me want to build with stainless.

That said, I have seen a few different actions that could work. I would appreciate some good advice for choosing the action. It appears my options would be 16, 116, and 12. The 116 is a small Shank, the 12 is a large, I think the 16 comes in small or large Shank, correct?

It will be 90% for hunting Elk, deer, and black bear in the mountains, 10% for target shooting at as far as I can improve to.

What action would make the most sense? Are there other stainless actions? Is the 12 an OK action to build a hunting rifle on?