I have one of those single shot zipgun looking Altor 9mm pistol. It quite accurate but is painful to shoot more than a couple times.
Looking for a reduced load for it. Most data I find is developed to cycle the slide, the Altor doesn't need that, its a single shot.
Thought about Trailboss but as it doesn't have enough power to cycle a 9mm pistol, there is no data on it that I can find. I just sent Hodgden an email about using Trailboss.