According to Hodgdon’s website, it looks like it uses magnum pistol powders, similar to 300aac and 450 bushmaster (IMR4227, 296/H110, Lil’gun). While bullet selection looks mainly to use 9mm pistol bullets, 125gr Barnes TAC-xp and 147gr XTP. It also uses 180gr Winchester powerpoint bullets which look to be a pistol/rifle hybrid. That’s just from the one website.

It looks like an interesting round, I just find it funny that Hodgdon already has data for 350 legend but it still doesn’t have anything for 458 socom years later.