WHAT DOES HODGDON US 869 POWDER CANADA MEAN?

A real magnum spherical rifle powder, it is excellent with large bullets in big, overbore rifle cartridges. US869 is a dense propellant which allows the shooter to utilize adequate powder to create greatest velocities in cartridges including the 7mm Remington Ultra Magnum, three hundred Remington Extremely Magnum, 30-378 Weatherby Magnum and Other