https://www.thefirearmblog.com/blog/...st-357-magnum/
"This new HST .357 Magnum load uses specially designed jacketed hollow point (JHP) projectiles. They were designed to defeat barriers without plugging up the hollow point. The JHP weighs 154-grains, finding the sweet spot between penetration and consistent bullet expansion. The nickel-plated case and high-performance primers give shooters assurances that their rounds will go off when they need them the most."
I'm not finding anything on it's velocity etc.