Ummm that seems really hot and this is the bottom end of their socom data with cfe black and a1680(43grains) top end is is about 48 for both. : r/ 458socom
Reloading Data .458 SOCOM (Shooters World) Metallic
458 socom ballistics - Google Search | Reloading ammo, 458 socom, Ballistics
458 SOCOM vs 45 70 - Cartridge Comparison by Ammo.com