WHAT DOES HODGDON US 869 POWDER CANADA MEAN?

A real magnum spherical rifle powder, it is superb with significant bullets in huge, overbore rifle cartridges. US869 is really a dense propellant which allows the shooter to utilize enough powder to build optimum velocities in cartridges including the 7mm Remington Ultra Magnum, 300 Remington Extremely Magnum, thirty-378 Weatherby Magnum and Other