WHAT DOES HODGDON US 869 POWDER CANADA MEAN?

A real magnum spherical rifle powder, it is excellent with heavy bullets in huge, overbore rifle cartridges. US869 is usually a dense propellant that allows the shooter to implement ample powder to develop optimum velocities in cartridges such as the 7mm Remington Ultra Magnum, 300 Remington Ultra Magnum, 30-378 Weatherby Magnum and Some others.Hod