The burning speed of this Intense Extruded propellant is acknowledged toshooters for decades. Eventually, Hodgdon has modernized H4350 powder by shortening the grainsfor enhanced metering and making it insensitive to scorching/cold temperatures. H4350 is great incartridges such as the 243 Winchester, 6mm Remington, 270 Winchester, 338 WinchesterMag