473 was a good 20 ga powder, tho' best for 7/8oz loads. 17.5-18grains was the typical recipe.
785 was a great powder in things like the 270 Winchester & 6mm Remington. They have not done a very good job of duplicating it in the 3 or 4 replacement "models" introduced since its discontinuance.

Imagine your grave on a windy winter night. You've been dead for 70 years.
It's been 50 since a visitor last paused at your tombstone.....
Now explain why you're in a pissy mood today.