Fed 3" Paper Base Wad Hull
Win 209 Primer
175 grains Pyrodex
Fiber Wad
550gr .730 round ball.
"Touch-of-white-glue" crimp
1450fps @ 9800psi

Balls must be harder than pure lead to be that light. a .715" pure lead ball weighs 545gr., normally. My chart lists .730" pure lead ball as weighing 583.3gr. - difference not important, just an observation.

My black powder load of 7 drams 2F (191gr.) fit inside a 2 3/4" plastic hull along with the base wad off a AA trap wad-w/fingers cut off - one cup-down on powder, one sup-up under ball, then taper crimped. - Fed Magic hull IIRC.
different hulls have different capacities. Some are straight sided inside, while others have tapered thickness sides.