First, I tried the IMI ammo that I documented on Tuesday to not shoot well in the 3.5" barrel P-10S. Then I switched to my standard Atlanta Arms 115 JHP ammo and proceeded to shoot a full size pistol group with the little pistol. Here is a 1 minute video showing 21 rounds as they hit the paper. The dead time between shots has been edited out but you can see that the pistol and I had a good day.
https://youtu.be/Hd1QDi8D0AUNothing against the IMI ammo--it shoots fine in the 4.5" barrel pistols. I think maybe the IMI powder burns slower than whatever AA is using, so IMI isn't the best choice for a subcompact pistol, that's all.
Joe