The CCI No. 250 Large Rifle Magnum stands as a cornerstone in the world of high-performance ammunition, serving as the primary ignition source for hunters and long-range shooters dealing with high-capacity cartridges. Engineered to provide a more intense and longer-duration flame than standard rifle primers, the CCI No. 250 Large Rifle Magnum is specifically designed to overcome the ignition challenges presented by large powder columns and temperature-insensitive propellants. Within the reloading community, the CCI No. 250 Large Rifle Magnum is widely respected for its reliability, especially in extreme weather conditions where standard primers might struggle to achieve a consistent burn.
- Primer Type: Large Rifle Magnum.
- Key Advantage: High-output initiator capable of igniting large volumes of slow-burning powder.
- Primary Match: Magnum-class cartridges and ball powders requiring high-energy ignition.
Best For: Extreme long-range hunters and precision shooters using large-capacity cases and slow-burning magnum propellants in cold environments.
Technical Specifications
| Manufacturer | Size | Cup Material | Packaging | Intended Action |
| CCI (Competition Chemicals Inc.) | Large Rifle | Brass with Nickel Plating | 100-count sleeves / 1000-count bricks | Bolt-action and semi-automatic magnum rifles |
Positioning in the Product Lineup
In the extensive catalog of CCI primers, the CCI No. 250 Large Rifle Magnum occupies the high-output tier of the Large Rifle family. While the CCI No. 200 Large Rifle is the standard choice for traditional rifle cartridges like 308 Winchester, the CCI No. 250 Large Rifle Magnum is the “heavy lifter.” It is positioned just below the CCI No. BR-2, which is the benchrest-grade version of the standard primer. Unlike the standard primers, the CCI No. 250 Large Rifle Magnum uses a specialized chemical mix that produces a hotter, more violent flame. This is not for increased velocity, but for ignition reliability. When compared to the CCI No. 34, which is a military-spec primer, the CCI No. 250 Large Rifle Magnum offers similar cup hardness but with the increased brisance necessary for magnum loads.
Compatibility and Safety Constraints
The CCI No. 250 Large Rifle Magnum is designed with a robust cup to withstand the higher pressures often associated with magnum cartridges. The cup thickness is engineered to prevent piercing and “blanking” when subjected to the 60,000+ PSI generated by cartridges like 300 Winchester Magnum. Because of this harder cup, the CCI No. 250 Large Rifle Magnum requires a positive, authoritative strike from the firing pin. Shooters using lightened target springs in their rifles may encounter occasional light strikes.
Proper seating is critical for the CCI No. 250 Large Rifle Magnum. It should be seated to a depth of 0.003-0.005 inches below the base of the cartridge case. This ensures the anvil is properly “set” against the priming compound, ensuring maximum sensitivity.
Safety Warning: Primer substitution is not a direct one-for-one exchange. If switching from a standard primer to the CCI No. 250 Large Rifle Magnum, you MUST reduce your powder charge by at least 10% and work back up to the desired load while watching for pressure signs.
Recommended Cartridges and Applications
The CCI No. 250 Large Rifle Magnum is the gold standard for any cartridge with “Magnum” in its name, but its utility extends to any case using slow-burning powders or large internal volumes.
| Cartridge | Primary Application |
| 7mm Remington Magnum | Big game hunting and long-range precision |
| 300 Winchester Magnum | Military sniping and elk hunting |
| 338 Winchester Magnum | Dangerous game and heavy timber hunting |
| 6.5 PRC | Precision rifle competition and western hunting |
| 7mm PRC | Modern long-range ballistics and hunting |
| 300 PRC | ELR (Extreme Long Range) target shooting |
| 270 Winchester Short Magnum | High-velocity mountain hunting |
| 300 WSM | Short-action magnum performance |
| 257 Weatherby Magnum | Ultra-high velocity varmint and deer hunting |
| 338 Lapua Magnum | Extreme distance tactical applications |
Powder Pairings
Magnums rely on slow-burning propellants to drive heavy bullets to high velocities. These powders, particularly those with heavy deterrent coatings (like ball powders), can be difficult to ignite consistently. The CCI No. 250 Large Rifle Magnum is specifically designed to work with these formulas.
- Hodgdon H1000: A staple for the 7mm Remington Magnum and 300 Winchester Magnum. The CCI No. 250 Large Rifle Magnum ensures this slow-burning extruded powder ignites instantly.
- Hodgdon Retumbo: Used in over-bore cartridges like 26 Nosler. The high output of the CCI No. 250 Large Rifle Magnum is required to maintain low standard deviations.
- Alliant Reloder 22: A classic magnum powder that performs best when pushed by a hot primer like the CCI No. 250 Large Rifle Magnum.
- Alliant Reloder 26: Known for high velocities in the 6.5 PRC, this powder benefits from the consistent ignition of the CCI No. 250 Large Rifle Magnum.
- Winchester 760: As a ball powder, it has high density and deterrent coatings that require the extra heat provided by the CCI No. 250 Large Rifle Magnum.
- Ramshot Magnum: This spherical powder is designed for large cases and relies on the CCI No. 250 Large Rifle Magnum for clean combustion.
- Vihtavuori N170: One of the slowest powders available, the CCI No. 250 Large Rifle Magnum is essential for proper pressure development.
Comparison and Alternatives
If the CCI No. 250 Large Rifle Magnum is unavailable, several competitors offer magnum primers with similar performance characteristics.
- Federal 215: Often considered the “hottest” primer on the market, frequently used in the largest Weatherby magnums.
- Winchester WLRM: Known for very reliable ignition in all weather conditions.
- Remington 9-1-2M: A consistent performer with a slightly different chemical composition than CCI.
- CCI BR-2: While not a magnum primer, some loaders use it in mid-sized cases for better accuracy, though it may lack the heat for true magnum powders.
- Fiocchi Large Rifle Magnum: A high-quality European alternative that has gained popularity for its consistency.
- Sellier & Bellot V361617: An affordable and reliable magnum primer often used in high-volume reloading.
- Ginex Large Rifle Magnum: Known for having slightly harder cups, making them excellent for preventing “slam fires” in semi-automatic rifles.
- RWS 5333: A premium German primer often used for long-range competition.
FAQ
Can I use the CCI No. 250 Large Rifle Magnum in a standard cartridge like 308 Winchester?
Yes, but it is rarely necessary and can actually decrease accuracy if the extra brisance disrupts the powder column. If you do use the CCI No. 250 Large Rifle Magnum in standard loads, you must reduce the powder charge and check for pressure signs, as the primer itself contributes to the initial pressure spike.
Why does the CCI No. 250 Large Rifle Magnum have a nickel-plated cup?
The nickel plating serves two purposes: it prevents corrosion during long-term storage and provides a smoother surface for consistent feeding in automated reloading presses and reliable strikes from the firing pin.
Is the CCI No. 250 Large Rifle Magnum “temperature stable”?
Primers themselves aren’t usually described as temperature stable, but the CCI No. 250 Large Rifle Magnum is designed to provide reliable ignition in sub-zero temperatures where standard primers might fail to ignite slow-burning “temp-stable” powders like those in the Hodgdon Extreme line.
What is the difference between the CCI No. 250 Large Rifle Magnum and the Federal 215?
The Federal 215 is generally considered to have a slightly higher energy output and a softer cup. The CCI No. 250 Large Rifle Magnum is often preferred by those using semi-automatic rifles because the cup is slightly harder, providing an extra margin of safety against slam fires.
Does using the CCI No. 250 Large Rifle Magnum increase muzzle velocity?
While a hotter primer can slightly increase velocity due to a more efficient initial burn, the difference is usually negligible compared to powder charge adjustments. The primary reason to use the CCI No. 250 Large Rifle Magnum is for ignition consistency, not speed.
Can I use the CCI No. 250 Large Rifle Magnum for black powder substitutes?
Many hunters using large-bore black powder cartridge rifles (like 45-70 Government with heavy charges of substitutes) prefer the CCI No. 250 Large Rifle Magnum because black powder substitutes can be harder to ignite than modern smokeless powders.
Conclusion & Expert Verdict
The CCI No. 250 Large Rifle Magnum remains one of the most trusted components in the reloading world for a reason. Its ability to provide consistent, high-energy ignition across a vast array of magnum cartridges makes it an essential item on any serious reloader’s bench. Whether you are hunting elk in the freezing mountains or competing in a 1000-yard match, the reliability of the CCI No. 250 Large Rifle Magnum ensures that when the firing pin drops, the rifle goes bang every single time.
Expert Pro Tip: When developing a load for a magnum rifle, don’t just focus on the powder and bullet. Testing the CCI No. 250 Large Rifle Magnum against other magnum primers can often be the final step in shrinking your groups from 1.0 inch down to 0.5 inches. In many large-capacity cases, the primer’s influence on the “Standard Deviation” (SD) of your muzzle velocity is the key to long-range success. Always ensure your primer pockets are cleaned of carbon so the CCI No. 250 Large Rifle Magnum can sit perfectly flush and square.
