A bulky extruded stick powder like N340 or N330. We like this powder better than 3N37, but overall, for 9MM its not that ideal. So many loads are somewhat compressed of you use lower overall lengths. Its just not that versatile either, and best suited for 115 grain and heavier bullets. We would recommend buying N340 for 9MM over this, similar performance, but since N340 is faster burning and you need less in the case to achieve slightly, barely less performance? That is overall better for 9MM overall.