No, it was some 120 years ago when muzzleloaders, blackpowder cartridges, and shotguns ALL began using a propellant designed to be a better sub for blackpowder.
That included "King's Semi-Smokeless," "Lesmoke," and quickly developed from the monopoly of DuPont-- from which Hercules, Goex, and IMR were all formed.
Are you serious? This is from Savage's website describing their ML10, and it's quoted verbatim:
"Call it innovation...call it thinking out of the box...at Savage, we call it listening to the needs of the hunter. That's why we developed the world's first smokeless powder muzzleloader."
So, are the folks at Savage all wet?
