The burning velocity of this Serious Extruded propellant has been known toshooters for many years. Over time, Hodgdon has modernized H4350 powder by shortening the grainsfor enhanced metering and rendering it insensitive to scorching/chilly temperatures. H4350 is great incartridges like the 243 Winchester, 6mm Remington, 270 Winchester, 338 Winches