<prompt> FG, FFG,FFFG...used to discribe: PGI Dec 2008PrimerCartridgeBlack gunpowderWadding  <response>: Ans: C B lack gunpowder FG, FFG, FFFG ... are used to discribe the size of grains of black gunpowder.Gunpowder Used in FirearmsBlack PowderQIt consists of Potassiu m nitrate 75, Charcoal 15 Sulph ur 10 Pnemonic - PCS in decreasing percentageIt is designated as FG, FFG, FFFG, etc., depending on size of the grains. More the no. of Frs, the finer are grains the faster the burning. The powder grains are black, coarse or fine, without any particular shape. It burn with production of much heat, flame smoke. The gas consists of CO, CO, M2, H..S, H2, CH4 etc,, ail at a very high temperature.Smokeless PowderQIt consists of nitrocellulose guncotton or nitroglycerine Si nitrocellulose double-base. Triple base poivder consists of nitrocellulose, nitroglycerine Si nitroguanidine,They produce much less flame smoke Si are more completely burnt than black powder.Semismoke Less Powder It is a mixture of 80 black Si 20 smokeless powder.Extra Edge: Type of BulletsYawning bulletQ - when bu Llet lose its gyroscopic traj ectory, it travels in an irregular fashionSauvenier bulletQ - When bulietremains embedded in body for a long time, it is encapsulated by fibrous tissue.Frangile bulletQ When the bullet breaks into multiple pieces before entering the target.Dumdum bulletQ - When the nose of bullet is sawn off cut, it mushrooms out on striking the target producing an entrance wound larger than the size of bullet.Tumbling bulletQ - When the bullet rotates end on end.Tandem bulletQ Piggyback bullet - When one bullet behind the other enters the body through the same enterance wound.Ricochet bulletQ - When a bullet alters its path due to deflection before entering the target.Karonlein shotQ When a bullet passes through skull brain causing bursting of skull with external herniation of brain material, it is called karonlein shot 