Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, lifelong hunter.
Percussion caps for muzzleloader use remain the ignition standard for inline rifles, traditional sidelocks, and cap-and-ball revolvers. These #11 percussion caps deliver the spark transfer you need to ignite black powder or black powder substitute charges reliably. For hunters patterning loads before deer season, re-enactors maintaining period-correct firearms, or competitive black powder shooters running strings at 50 yards, consistent ignition starts with the cap.
Performance at a Glance
Each #11 percussion cap seats onto a standard nipple, creating a sealed chamber that channels primer flame directly into the powder charge. When struck by the hammer, the priming compound detonates, sending a jet of flame through the flash channel. In inline muzzleloaders, this ignites the pelletized or loose powder; in traditional rifles, it travels through the drum or bolster to reach the main charge. Moisture resistance matters: store caps in a cool, dry location and seat them only when ready to fire.
The Numbers
| Spec | Value |
|---|---|
| Type | #11 percussion cap |
| Application | Muzzleloaders (inline, sidelock), cap-and-ball revolvers |
| Nipple fit | Standard #11 nipple |
| Ignition method | Impact-sensitive priming compound |
Percussion caps are a staple in the primers category, serving black powder shooters who value simplicity and historical accuracy in their ignition systems.
Who It’s For
If you hunt with an inline muzzleloader in states with primitive-weapons seasons, these caps are your ignition source. Re-enactors running Civil War-era rifle-muskets or cap-and-ball revolvers rely on #11 caps to maintain period-correct function. Competitive black powder shooters use them to pattern loads and verify zero before match day. Caps fit standard nipples across most inline and traditional platforms, making them a versatile choice for anyone who shoots black powder.
Care & Maintenance
Store percussion caps in their original tin, away from heat sources and out of reach of children. Moisture degrades priming compound, so keep them in a climate-controlled environment. When seating a cap, press it firmly onto the nipple until you feel resistance — a loose cap can misfire or fall off during handling. After firing, clean the nipple and flash channel with a pipe cleaner or nipple pick to remove fouling; hardened residue can block flame and cause hangfires. Inspect nipples for wear: mushroomed or eroded nipples should be replaced to maintain reliable ignition.
Safe Handling & Compliance
Federal law requires purchasers to be at least 18 years old for rifle and shotgun ammunition, and at least 21 for handgun ammunition. Ammunition cannot be shipped to certain states, counties, and cities — review our ammunition shipping restrictions before ordering. Store ammunition in a cool, dry location away from heat sources and out of reach of unauthorized users.
- Treat every firearm as if it were loaded; keep your finger off the trigger until ready to fire; never point the muzzle at anything you do not intend to shoot; be certain of your target and what lies beyond it. Review the four rules of firearms safety before handling any firearm.
- Verify current federal, state, and local regulations governing the purchase, possession, and use of percussion caps and muzzleloading firearms in your jurisdiction. Some areas restrict black powder firearms or require permits; confirm compliance before ordering.
- Seat caps only when ready to fire. A prematurely seated cap can discharge if the hammer is bumped or dropped, sending flame into the powder charge.
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