Constituents of black gun powder is all EXCEPT:
C i.e. Lead Peroxide Smokeless gun powder is composed of nitrocellulose & nitroglycerineQ. Smoke producing black gun powder contains "PCS" i.e. potassium nitrate charcoal and sulfurQ. It is described as FG, FFG, FFFG depending on the fineness (F)/size of grain (G).
Charcoal
KNOB
Lead peroxide
Sulphur