Hopefully we will see it spread. And it will only be a general commercial success if mainstream US ammo makers cater for it, or at the usual ammo makers for unusual big bores such as Norma, Hornady etc.

And if some gunmakers also cater for it. Bringing the cartridge into the affordability of common gunowners. Maybe a Ruger no.1 could be chambered for it?

Being a rimmed cartridge, makes it less likely in cheaper firearms, as it is usually only the break open and similar actions which use the rimmed cartridges. Single shots and doubles.