The burning pace of the Extreme Extruded propellant is identified toshooters for many years. Over time, Hodgdon has modernized H4350 powder by shortening the grainsfor enhanced metering and rendering it insensitive to incredibly hot/chilly temperatures. H4350 is great incartridges like the 243 Winchester, 6mm Remington, 270 Winchester, 338 Winchest