Last reviewed: 2026-04-17 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
CCI Large Pistol Primers #300 anchor the foundation of reliable handloads. Large pistol primers ignite standard-pressure cartridges from 9mm to .45 ACP with consistent flame spread and minimal residue. CCI engineers its primers for progressive and automated loading equipment — the anvil geometry and cup hardness accommodate high-speed feeding without misfires or crushed primers. You seat them with uniform force, and they fire when the striker drops.
Built for the Box
CCI manufactures the #300 with a non-corrosive, non-mercuric initiator mix. That chemistry eliminates moisture-driven fouling in the primer pocket and protects brass cases across multiple reloading cycles. The company continually tests sensitivity thresholds to balance reliable ignition against accidental discharge — current production runs fire consistently across bolt-action, semi-automatic, and revolver platforms without requiring excessive striker energy. CCI packages primers in plastic trays inside cardboard sleeves, a format that protects the anvils during shipping and simplifies press feeding.
Specs at a Glance
| Spec | Value |
|---|---|
| Primer Size | Large Pistol |
| Quantity | 1000 or 5000 count |
| Initiator | Non-corrosive, non-mercuric |
| Country of Origin | United States of America |
| Shipping Weight | 1.010 – 5.275 lbs |
| DOT-Regulated | Yes |
| HazMat Product | Yes |
| Manufacturer | CCI |
CCI designs the #300 for use in cartridges requiring large pistol primer pockets — .38 Special, .357 Magnum, .44 Magnum, .45 ACP, .45 Colt, 10mm Auto, and similar chamberings. The standard cup hardness suits semi-automatic pistols with spring-driven firing pins and revolvers with hammer-driven systems. Handloaders match primer sensitivity to powder burn rate: fast-burning powders benefit from the #300’s moderate brisance, while magnum loads often require the hotter CCI #350 Magnum Large Pistol primers. Browse additional large pistol primers for comparison across brands and sensitivity profiles.
Who It’s For
Competitive pistol shooters assembling match-grade .45 ACP loads rely on primer consistency to eliminate velocity spread. Cowboy action shooters loading .45 Colt appreciate the clean-burning residue profile across 50-round stages. Self-defense handloaders building 10mm Auto cartridges require primers that ignite reliably after months of carry in humid environments — the non-corrosive chemistry prevents pocket corrosion that can delay ignition. High-volume reloaders running Dillon or Hornady progressive presses depend on the #300’s feeding characteristics to maintain cycle speed without jamming primer tubes.
Safe Handling & Compliance
Federal law classifies primers as Class 1.4S explosives under DOT hazardous materials regulations. Primers ship via ground transportation only — no air freight. Shipping carriers impose quantity limits per package, and some states restrict direct-to-consumer primer sales. Verify current restrictions in your jurisdiction before ordering. Store primers in original packaging, in a cool, dry location away from heat sources, open flames, and solvents. Do not expose primers to impact, friction, or static discharge outside the controlled environment of a reloading press.
- Handle primers individually — never bulk-transfer loose primers in metal containers.
- Seat primers to manufacturer depth specifications — over-seating crushes the anvil and causes misfires; under-seating allows primer movement and inconsistent ignition.
- Inspect each primer pocket for debris, corrosion, or deformation before seating — a damaged pocket can puncture the primer cup during ignition.
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