Perfesser Marvelous 
Some off topic, but, PLEASE tell me you're not really subjecting you guns to that Pyro guaranteed Rust Alot!! As a known Alchemist I just know you wouldn't do it!!
Right??
Ah My Good Coffin
I have related in the past that I do use it, on occasion.
I ONLY use those two items when there is absolutely no other powder, and only in several specified revolvers.
These revolvers, if used with P or 7 are broken down and meticulously cleaned/scrubbed/disinfected beyond normal BP methodology.
I have a multistage method that has served me OK so far with these confounded substances as well as with corrosive primers.
BTW I am planning experiments with an cheap HF ultrasonic cleaner .....
SO FAR in the gloriously dry Great Southwest, I have not had corrosion issues.
The canisters of the stuff were obtained cheaply ( ie less than $5 per pound ) at clearance events and set aside
"against a time of need" . I have found that if unopened it seems to last a good while.
when powder was totally unavailble, I tapped into those icky reserves.
But by relegating Schofield cases to "that stuff" , there is no question what I am grabbing :-)
Now that owder is trickling in again, the "bad stuff" can go to the back of the shelf again, after purging the open
bottle with CO2 "for luck" ....
I have to check with the local BP club (if it still exists ) and organize a group buy. esp If Goex comes back soon...
then i can put aside my experiments in grinding, corning, pucking, screening, etc.
yhs
prof mumbles