The burning velocity of this Intense Extruded propellant has been known toshooters for many years. After some time, Hodgdon has modernized H4350 powder by shortening the grainsfor improved metering and making it insensitive to warm/chilly temperatures. H4350 is great incartridges including the 243 Winchester, 6mm Remington, 270 Winchester, 338 Winc