The original 1946 smoke bulb pellets are noxious, hazardous, & very corrosive.
You will have no problem with the SP type pellets, original or repro, aside from the usual issue of the liquified pellet material being prone to spill out of the bulb dimple. Some folks have used a "sock" on the bulb of their own design to reduce spilling and enhance smoke output & pellet material retention(works with smoke fluids too).