WHAT DOES HODGDON US 869 POWDER CANADA MEAN?

A true magnum spherical rifle powder, it is great with weighty bullets in significant, overbore rifle cartridges. US869 is usually a dense propellant that permits the shooter to work with ample powder to make greatest velocities in cartridges such as the 7mm Remington Extremely Magnum, 300 Remington Extremely Magnum, 30-378 Weatherby Magnum and Oth