Stay with H50BMG, or Reloder-50.
US869 has been reported to be extremely temperature sensitive, although I have no knowledge as I have not used it.
V.V. 20N29 is also temperature sensitive, but a good powder if rounds are pre-heated to 110-130 degrees.
Virgin H5010 is good if of the original mix, later mixes are 10% hotter than earlier and have caused some issues.
I do not use pull-down powders.