Clearly, the Deerfield is based on the Mini 14 action.
Old Ruger carbine on top. Deerfield on the bottom
The Deerfield uses the open top receiver, exposed rotating bolt and gas system of the Mini 14. Not to mention a detachable mag instead of the internal tube mag on the Deerstalker/44 Carbine.
Could they make one in 357mag? Probably. Would they? Probably not, that day has passed. As I said the 350 Legend is a better candidate in that it would fit the current dimensions of the Mini 14 and could use AR mags. I would guess that would also be unlikely since they already make a 350L in the AR platform which is much cheaper to produce than the Mini.