WHAT DOES HODGDON US 869 POWDER CANADA MEAN?

A true magnum spherical rifle powder, it is excellent with significant bullets in massive, overbore rifle cartridges. US869 can be a dense propellant that permits the shooter to use more than enough powder to build greatest velocities in cartridges including the 7mm Remington Extremely Magnum, three hundred Remington Extremely Magnum, thirty-378 We