WHAT DOES HODGDON US 869 POWDER CANADA MEAN?

A true magnum spherical rifle powder, it is superb with major bullets in massive, overbore rifle cartridges. US869 is really a dense propellant which allows the shooter to utilize adequate powder to produce greatest velocities in cartridges like the 7mm Remington Ultra Magnum, three hundred Remington Extremely Magnum, 30-378 Weatherby Magnum and ot