WHAT DOES HODGDON US 869 POWDER CANADA MEAN?

A real magnum spherical rifle powder, it is great with heavy bullets in major, overbore rifle cartridges. US869 is actually a dense propellant which allows the shooter to work with adequate powder to develop greatest velocities in cartridges including the 7mm Remington Ultra Magnum, three hundred Remington Extremely Magnum, 30-378 Weatherby Magnum