[Seruzawa]

Putting smokeless powder in cartridges designed for black powder is chancy at best. Using such cartridges in the rifles designed for black powder is insane. The writer and poster of this article are fools, at best. Doing this can maim, blind and/or kill you.

This is beyond foolish.

[CurlyDave]

...Putting smokeless powder in cartridges designed for black powder is chancy at best...

Just off the top of my head, .30-30 and .38 special were both originally black powder cartridges. Lots of these are loaded with smokeless powder and sold every year.

[Charles Martel]

Yes, transitioning from black powder to smokeless is something that should be approached with caution. However, the Winchester 1886 action was originally loaded up to .45-90, IIRC, putting it near "buffalo gun" status early on.
The .50-110 smokeless chambering is pretty common today, though I'd base such a rifle on a new/reproduction action. The '86 design is stout beyond belief.