Most period round ball guns I've examined have twist rates of 1 in 50 or slower. One I saw years ago had a twist of 1 in 90.
Thompson Center for years adopted a compromise twist rate in its guns of about 1 in 48. They would adequately stabilize both round balls and conicals.
When Pennsylvania mandated round ball only, they came out with the Pennsylvania Hunter, which was a .50 with a twist rate of 1 in 66.
The general rule of thumb is the shorter the bullet, the slower the twist rate needed to stabilize it.
The longer the bullet (and heavier, generally) the faster the twist rate.
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