Alliant Black MZ was made by APP. Only one granulation which is more course than 3F. When Sportsman’s Warehouse was closing it out at $9.99 per pound I picked up a supply. I mostly used it for 12 gauge figuring it would meter better in the MEC bushing compared to the powder measure on my metallic cartridge press. About a year ago I added a .44-40 rifle to the safe. I decided to use Black MZ to work up a load. I charged cases with the capacity shown on APP’s website but I think it was not quite up to the base of the bullet. When I chronographed that test batch they were a little inconsistent. An experienced shooter recommended foam caulk backer rod as a filler. I started with his recommended load, which was less than 20 grains, inserted the foam rod and cut it flush with the case mouth, and seated a bullet. When I clocked them they were consistent and the velocity was not much lower than the almost-full loads. It is not a “wimpy cowboy load”; it’s a 200 grain bullet at almost 1000 FPS. Yes, the Black MZ often clumps in the container. Rumor has it the powder was improperly stored at one point. When I open a new one pound container I insert a wooden paddle to break up the largest clumps, then I pour some into a clear Pyrex measuring cup where it gets more stirring, then through a funnel into my powder measure. It takes just a minute. Happy to do so at the price I paid.