Ammunition

Category Overview

Overview

Ammunition refers to the complete round or components required to fire a weapon — projectile, propellant, primer, and cartridge case (in modern terms). The development of ammunition has been as important to weapons history as the development of the weapons themselves; improvements in propellants, bullet design, and cartridge technology have repeatedly transformed what firearms could do.

Pre-Cartridge Ammunition (before 1860s)

Projectiles

• Stone ball — Earliest cannon ammunition; required specialized quarrying; irregular shape reduced accuracy
• Iron ball (roundshot) — Standard cannon projectile; 3–68 pounds; effective against ships, walls, and formations
• Lead ball — Standard small-arms projectile through the musket era; .40–.80 caliber
• Minié ball — Conical lead bullet with hollow base; the base expanded on firing to engage rifling; allowed muzzle-loading rifles to be loaded as fast as smoothbores; transformed infantry warfare in the American Civil War

Propellant

• Black powder (gunpowder) — Potassium nitrate, charcoal, and sulfur; the only propellant until the 1880s; produces heavy smoke; hygroscopic (absorbs moisture); burns relatively slowly

Ignition

• Touch hole — Direct ignition of the charge; earliest cannon
• Slow match — Smoldering cord held to the flash pan (matchlock)
• Wheel lock — Spinning serrated wheel against iron pyrite; 1500s
• Flintlock — Flint strikes steel frizzen; creates spark in pan; 1610s–1860s
• Percussion cap — Mercury fulminate cap struck by hammer; 1820s; reliable in wet conditions

Metallic Cartridge Era (1860s onward)

The self-contained metallic cartridge — combining primer, propellant, and bullet in a brass case — transformed firearms:

• Rimfire — Primer compound in the cartridge rim; .22LR still uses this
• Centerfire — Replaceable primer in the center of the case base; the standard for all modern military ammunition
• Smokeless powder — Nitrocellulose-based propellant; replaced black powder 1880s–1890s; produces far less smoke; allows higher velocities; enabled the modern high-velocity small-bore rifle

Modern Ammunition Types

• Ball — Standard military ball ammunition; full metal jacket; penetrates without expanding
• Hollow point — Expands on impact; maximizes tissue damage; prohibited in military use by Hague Convention
• Armor-piercing — Hardened steel or tungsten core; penetrates body armor and light vehicles
• Tracer — Pyrotechnic compound in the base; visible trajectory; used for fire adjustment
• Incendiary — Phosphorus or other incendiary compound; sets fires on impact

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