Love the "WE" from the second slug in the video.
WE took the taper out of the case, WE necked it down.
It's the .17 Ackley Hornet, inna nutshell.
And it's been around in one form or another for a very long time.
Lotsa load info around, lotsa data for what to do to make an accurate rifle for it, too.
Hopefully the makers don't stick a huge, long throat on the chambers.
Having some dies available for reasonable prices, as well as off-the-shelf empty cases, is great, though.
It may be a buck a round for loaded ammo, but it's 650-700 or more reloaded rounds to a pound of powder.
Looking forward to the sorting out of the details, and maybe ordering a reamer to suit!
Cheers
Trev