Email arrived finally, Here's what they said about Black Mag MZ discontinuation.

Joseph,
I have not been informed that it is being dropped.
What I have been told is that there has been large amount sitting in the warehouse for some time. Until this is sold, an assessment will then be made as to when the next batch may be made.

Thanks,
Duane V.
Technical Services Rep

Alliant/Blazer/CCI/Speer
2299 Snake River Ave
Lewiston, ID 83501
1-800-379-1732