Technically black powder is 'plastic' but requires a large pressure to squeeze the grain and make the sulfur behave in a plastic manner.
If it contains something other than charcoal, sulfur and potassium nitrate, it is no longer black powder but something else.
Having said that, the usual way of making black powder plastic is mixing it with nitrocellulose.
Then you use an appropriate solvent to make the mix plastic.
These are semi-smokeless powders and have been around for a long time.
APCP is the usual 'plastic' propellant for rockets.
It was literally used in the space shuttle boosters and is still used today in missiles and rockets.
Ammonium Perchlorate can be made with table salt (non-iodized please), electricity and an appropriate ammonia salt.
It is a bit more complex than that but those are the basic ingredients.
You add in a butyl rubber (widely available) and you have a rubber rocket fuel.
The advantages are:
It is water proof.
It is resistant to cracking.
It has a high impulse.
It is easy to mold into any shape you can design a mold for.
The disadvantage:
If there is Chlorate present when converting to the Ammonium salt, it has a tendency to go boom when drying.
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