After 24 shots, I have my new heavy lead load.
I settled on a No Excuses .500 diameter 460 grain on a Muzzleloading Originals .54 caliber treated felt wad on top of 90 grains of Schuetzen 2Fg and a CCI #11 cap.
I can get off two shots with great accuracy. Then I have to spit patch to seat the third bullet and wad.
Here it is at 25 yards. The low shot was before adjusting elevation one last time.
And at 50 yards. Not too bad for a rifle having a big ole ghost ring rear sight.