So I see Henry rifles being converted to .470 Turnbull - does anyone know if they can be made into .50 Alaskan also?

Cheers,
Ash.

I would think so. Turnbull Restoration could tell you. I had a Marlin Cowboy in 45/70 converted by Turnbull about 15 years ago. It has never let me down and is the first rifle I reach for.