Sam Fadala is an enabler, LOL!
I never loaded less than full chambers of 4f in my ROA; I wanted all the velocity I could get, so I figured if I wanted less performance, I'd load the more readily available 3f. I managed to score some .457 balls that had a 4 or 5% tin content, and they were actually pretty accurate with 4f loads. I even went to the trouble to cut up some 3/8" round pieces of flash paper in a semi-successful attempt to defeat the trickle-through problem, but all in all, 4f was more trouble than it was worth.
Funny how I have yet to try 777, or even feel the need to so do; for those who have, what's the performance gap between in and 3f or Pyrodex P? Enough to abandon the use of 4f?