There are a few threads on here about using surplus powders (WC870 and WC872) in cast bullet rifle loads. Some have had success in the larger overbore magnum cartridges and some have used them in .308 and .30-06 with good reports. Has anyone used the commercial stuff (H50BMG or Reloder 50) in cast bullet loads? Specifically, I'm wondering about .338 Win Mag.