The whole thing just sounds like a bad idea. Requires a 4473 and you are locked into an expensive (~$3) per powder charge that is at this point single source non reloadable. This has all the signs of being an abandoned by the manufacturer $500 paperweight in 3 years.
Never mind that more than a few states will likely classify it as not a muzzleloader.
$500ish is getting into nice premium inline territory. I think your better served elsewhere.
