Has anybody seen these

Not new in decades (think the 44 version came out early '70s). TC had special choked "hot shot" barrels. The chokes were designed to stop the spin, the rifling imparted.

In use they were a lot less versatile that one would think and they went the way of the dodo.

Those are pretty darn rare today. That sharp-veined Hot Shot choke would stop the rotation of the capsule as @jmorris posted, as well as cut open the plastic capsule to allow the shot to disperse. I can recall seeing some of those for sale ages ago, but they weren’t produced for all that long.

Stay safe.

I think that I have a box of factory loaded ammo around here still. I'll look for them. That barrel went away long ago.

It was a work around when the 45/410 was banned as a sbs . Due th copycats like Walter Craig importing sawed off 410 shotguns from Brazil with shallow rifling scratched in the barrels to take some sales from TC and their Contender 45/410.
Many folks bought the 44 Hotshot barrel and promptly had it rechambered to 410. I have no idea how 44 mags worked after that.
I have a 44 hotshot barrel but it is missing the choke. The fee I've seen were priced at platinum level.