Good call on the cast Para...  I forgot about using pistol powder for cast loads (I myself use AA5744 with my cast loads).  However, I believe RetiredMil is looking to use W296 with bullets he is pulling from older ammo from the 30s.  Like Fred says, an accidental double charge could spell catastrophe!

RetiredMil… if I'm incorrect in my assessment, then I do apologize.  I do think a better powder to use would be something like IMR-4350 for heavier bullets like 220 gr, or IMR-4064 for bullets in the 150-180 gr range.