.45/.410
Notice that all the guns that chamber both .45Colt & .410 (T/C Contender, Taurus Judge, S&W Governor, etc.,) and all listed as .45 Colt/.410. In that order.
They are
.45 caliber guns that will also shoot the
.41 caliber shotshells.
It DOES NOT work the other way around.
The .45 Colt chamber is the right size to take the back end of a .410 shell. The front end of the .410 shell is small enough to fit in the .45 chamber & bore, and work well enough at close ranges. The shot doesn't care much that it is undersize for the bore, at pistol ranges, and the basewad & shotcup provide an adequate gas seal in the .45 bore. Some spin is imparted by the rifling, (which is bad for patterns), but a little practice will show you where the biggest "hole" in the pattern is, at pistol distance, and you can compensate for that.
I got a chance to check out one of the Winchester 9410 at a gun show some time back. This was just after Winchester had closed down and it seemed everything with a Winchester name on it had the price jacked up a couple hundred dollars, almost overnight....
It was very nicely done (new gun, in the box), seemed pretty good, until the guy told me it was $900.
At the time, there was no way I was going to pay $900 for any model 94, new or old, .410 or any other caliber. I'm not a Winchester collector, have other .410s, and while it was neat, it simply wasn't worth it to me, at the time.
Not sure what they go for now, probably make that $900 deal look real good today...sighs...
If you want a .30-30 size and style gun that has the utility of a .410 shotgun, its the only game there is for that. If you just want a good .410, there are lots of choices, some much better, at least in terms of price.
Again, they should NOT be loaded with .45 Colt shells. I doubt the gun would fail catastrophically (blow up completely), but one never really knows, and it certainly can't be good for it, squeezing a .45 bullet down a .41 barrel.