WHAT DOES HODGDON US 869 POWDER CANADA MEAN?

A true magnum spherical rifle powder, it is excellent with weighty bullets in large, overbore rifle cartridges. US869 is usually a dense propellant that permits the shooter to use plenty of powder to make utmost velocities in cartridges such as the 7mm Remington Ultra Magnum, 300 Remington Extremely Magnum, thirty-378 Weatherby Magnum and Other fol