About a year ago, Hodgdon took over distribution of Winchester propellants. While I haven't visited Hodgdon's web site, the Hodgdon Annual Relaoding Manual lists all its propellant loads, but lists the loads for Winchester propellants (WW748, WW760) separately. I would tend to believe everything listed as "Win" is for Winchester propellants. Incidentally, WW748 is a great .223 powder, as is Varget.