Originally Posted by bronko22000

Semi mentioned stripping.
I hope you're not trying to tell me that a 1:20 twist out of a 10" barrel and a 1:70 twist from a 35" barrel are spinning at the same rate! If so that is not true. When the projectile is engaged in the rifling regardless of the twist rate that ball will continue that twist rate even after it leaves the barrel.
A 1:70 twist will rotate the ball at a rate of one full turn every 70" regardless of the barrel length (10" or 32").
Could it possibly be the large difference in velocity that requires the faster twist for the pistol?