Magnum rifle powder with exactly the same burn rate as standard IMR 7828 and uses the same data. Its super-short granulated powder meters nearly the same as spherical powders and allows more powder in the case,so it yields more velocity than standard 7828 in many loads.
Brownells Christmas , Issue:5X, Page:018
Big Book Catalog, Issue:68, Page:545
Sinclair, Issue:5B, Page:093