WHAT DOES HODGDON US 869 POWDER CANADA MEAN?

A real magnum spherical rifle powder, it is great with major bullets in massive, overbore rifle cartridges. US869 can be a dense propellant that allows the shooter to work with sufficient powder to build optimum velocities in cartridges including the 7mm Remington Extremely Magnum, 300 Remington Extremely Magnum, thirty-378 Weatherby Magnum and Oth