I used to have a sp101 .357 that would stop rotating after a few dozen rounds-I thought it was simply dust or particles from the bullets & it would go away with a quick cleaning ( usually ) I would shoot mostly fed hydrashok at the time-was that crimp jump?
( man I wish I still had that gun )
In that case, it is highly unlikely that it was crimp jump, as that typically happens with very lightweight guns, and not heavier all steel guns. Moreover, crimp jumping is a very intermittent problem even on gun/ammo combinations that are susceptible. From what you describe, I would suspect that your particular SP101 might have had too tight a tolerance between the cylinder and the forcing cone. When the tolerances are too tight there, the little bit of expansion of the metals due to heat, or the slightest amount of carbon fouling can result in the cylinder binding.
