WHAT DOES HODGDON US 869 POWDER CANADA MEAN?

A true magnum spherical rifle powder, it is great with significant bullets in significant, overbore rifle cartridges. US869 is often a dense propellant that allows the shooter to make use of ample powder to develop greatest velocities in cartridges like the 7mm Remington Extremely Magnum, three hundred Remington Ultra Magnum, thirty-378 Weatherby M