Forensic Medicine Mechanical injuries 37926254 Black gun powder composition - A Carcoal 60% + Potassium nitrate 20% + sulphur 20% B Charcoal 25% + Potassium nitrate 70% + sulphur 05% C Charcoal 15% + Potassium nitrate 75% + sulphur 10% D Charcoal 65% + Potassium nitrate 20% + sulphur 15% High-Yield Explanation The synopsis of forensic medicine & toxicology ; Dr k.s narayan reddy ; 28th edition ; Pg.no. 125 Fine grains travel 60cm or more ,one gram of powder produces 3,000-4,500c.c of gas