[fwlr]

Yes, I suspected that if there were dependencies on black-powder, it was because it was being used in older weapons systems and those were being supplied to Ukraine.

There are plenty of black-powder substitutes that are carefully designed to match various characteristics of standard black-powder, including 1:1 volumetric substitution and similar pressures https://en.m.wikipedia.org/wiki/Black_powder_substitute

If black-powder is strictly necessary and not just convenient, these substitutes would be used.