Here's what Hodgdon says about this "ancient" powder of which you speak. This, from the 2021 Reloading Annual Manual.
"This Extreme Extruded powder has won more benchrest matches than all other propellants combined. It provides match grade accuracy in small and medium capacity cartridges like the 223 Remington, 6mm PPC & the 7mm TCU. As a fine extruded powder, it flows through powder measures with surperb accuracy".
Hodgdon propaganda, no doubt but you were wrong on it being pre "Extreme".
