Don't worry lovers of Black MZ I'm sure it will be back under a new name again.
Although, when examining the list of failed propellants it's clear to see only one has stood the test of time---Real black powder.
There really is no substitute.
All these powders are now gone or on their way out.
Alliant Black mz
Alliant Black Dot
Shockley's gold
American pioneer
Clean shot
Golden powder
Black Mag 3
Goex pinnacle.
Black Canyon
That American Pioneer stuff was horrible. My first year of ML I purchased some cause there was a shortage of BP as well as even subs where I live and got some AP up in PA at a Gander MT (another failed venture). The 2F was more like 1F. very chunky and inconsistent. I heard the same of "Shockey's gold)
I still have 1/2 lb of that American Pioneer stuff. In a sidelock, it was yielding a delay in ignition. A guy at the range gifted me 1/2lb goex and showed me to duplex 10-15grains of real BP to get the ignition going with the sub on top of that.