The .257 Marksman (25 western)

[WKR]

I wonder how likely it is for Winchester to come out with this round from the factory? Seems like the 257 bore is gaining popularity again and there should be a market for a fast twist 257 magnum.

Doubtful at best. Too overbore and "modern" for a company like Winchester. I'm sure they thought about it when they developed the 6.8 western case but someone talked them out of it.