WHAT DOES HODGDON US 869 POWDER CANADA MEAN?

A real magnum spherical rifle powder, it is great with heavy bullets in significant, overbore rifle cartridges. US869 is often a dense propellant that allows the shooter to employ adequate powder to make utmost velocities in cartridges such as the 7mm Remington Extremely Magnum, three hundred Remington Ultra Magnum, 30-378 Weatherby Magnum and othe