I used the flint version for decades, and a 530 ball with 0.015 patch seemed to be good with 80 grains of 3F BP.
Close range whitetail deer here, so no need for more horsepower.
Sabots never worked for me, maxiballs were OK, but expensive and overkill.
Rifling is shallow, so it is a compromise barrel with the 1/48 twist. My opinion is the shallow rifling is a bigger factor than the twist.
