I took this hog with a 495 gr. No Excuses bullet in a .50 caliber Knight KRB, using 90 grs of Goex FFG blackpowder. The bullet completely penetrated and exited the hog, which ran about 40 yards and piled up.
3 other guys on the hunt took similar hogs with their muzzleloaders, 2 using round balls in .50 and .54 caliber and one using a 250 gr saboted bullet of some sort. None of those projectiles exited on broadside shots similar to mine.
The No Excuses bullets load very easily (much easier than any sabot combo I have ever tried) and shoot accurately with charges heavy enough to bump them up to groove diameter when they are fired.
I tried loads of up to 110 grs of FFG Goex but settled on 90 grs. as a load that gave great accuracy without severe recoil.
HOWEVER, I would not be surprised if they did NOT work well with BH209 powder, because it requires a very tight seal of the bore (such as provided by a sabot) at the moment of ignition. The No Excuses bullets are slightly smaller than bore diameter to permit easy loading, and they expand to groove diameter and engage the rifling when the pressure hits them. I would expect hangfires or maybe even misfires using BH209.
No Excuses bullets are excellent for large game, but should be used with blackpowder or Pyrodex for best results. They would probably do well with 777 also.