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 a dense propellant that enables the shooter to make use of more than enough powder to produce maximum velocities in cartridges like the 7mm Remington Extremely Magnum, 300 Remington Ultra Magnum, thirty-378 Weatherby Magnum and O