Due to the increasing distance of the mass from the centre, small balls require a faster twist than larger ones. Thus a .32 should be in the 1:30ish region whilst an 8 bore will be happy with 1:120 or less. The need is for a level of rotational momentum which can either be small spun fast or large spun slow. Forsyth recognised that the ability of a large ball to accept a slow twist meant that one could use a larger charge without the ball stripping on the rifling yet get decent accuracy. Thus Forsyth style rifling only comes into it's own in 20 bore or above.
So the answer to the OP is that, in these smaller calibres, the common 1:48 twist is marginal but workable but a 1:30 is probably more suited to .32 or similar. So faster than 1:48 but slower than 1:30. What the faster ones will do is still stabilise the ball with lesser charges. In effect giving the same revolutions per second. You get the same RPS from a slow ball spun fast or a fast ball spun slow and RPS governs the stability of a ball in flight (ceteris paribus). In a conical the same principle applies but the variables are far more complex than that with which my hard of thinking brain can cope.
BTW, for the terminally bewildered like myself, faster means a twist with a lower number and slower the converse. Not absolutely intuitive.