For cast lead bullets without a gas check I wouldn't use W296 or H110 same powder different can. You pretty much will have to shoot near max loads with those powders as you can't download them,I don't know if there even listed in the Lyman manuals for use with cast bullet loads,for me those two powder works best with jacketed bullets.
You best choice would be Alliant 2400 or Unique with your cast bullet loads much better flexibility with cast lead bullets.