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I have used it for plinking loads in .45-70 and .38 Special power level loads in .357 magnum cases. I like it as a powder.
It is, however, smokeless powder and should never be used in a muzzleloader.
It's not that muzzleloaders are too weak to handle smokeless pressure, a Ruger Old Army is essentially a modern revolver converted to cap and ball.
It's that smokeless powder needs a powerful primer to reliably establish the initial chamber pressure for proper burning. That's why cap and ball pistols will handle smokeless if they are converted to cartridges.
On the other hand, a single ember entering the touch hole of a flintlock will make a charge of black powder go boom.
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