In a centrefire pistol cartridge, which component directly ignites the propellant charge when the firing pin strikes the weapon?
- A The rim of the cartridge case
- B The base wad over the powder column
- C The percussion primer seated centrally in the base of the case ✓
- D The cannelure on the bullet jacket
Correct answer: C. The percussion primer seated centrally in the base of the case
Explanation
In centrefire ammunition the priming compound (fulminate-based mixture) is held in a cap seated at the centre of the cartridge head. The firing pin crushes it against the anvil, producing a flash that ignites the propellant. The rim is relevant only in rimfire cartridges such as .22, where the priming compound lies inside the folded rim. Cannelures and wads do not initiate combustion.
Reference: Parikh's Textbook of Medical Jurisprudence and Forensic Medicine, 7th ed.
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