Reliable Hercules 2400 powder reloading data, now manufactured and published under the name Alliant 2400, can be found in modern manuals from Hornady, Speer, Lyman, and the Alliant Powder online reloading guide. Hercules 2400 specific load data is critical because it is a classic magnum handgun powder designed for heavy loads in cartridges like the .357 Magnum and .44 Magnum, as well as small rifle cases like the .22 Hornet and .30 Carbine. This powder differs from slower magnum powders like H110 or W296 because it ignites much easier, meaning it generally does not require magnum primers and can safely be downloaded for mid range target loads. Published Hercules 2400 data heavily covers common jacketed and cast lead bullet weights, such as 158 grain .357 projectiles and 240 grain .44 projectiles. Using specific published data for this powder is vital because older manuals often listed maximum charges that exceed modern SAAMI pressure specifications. Reloaders must always rely on current published data to ensure safe chamber pressures across different firearm platforms.
Hercules 2400 Powder Reloading Data
| Bullet | Bullet Weight | Powder | Published Starting Load | Published Maximum Load | Published Velocity | Barrel Length / Firearm | Source |
| Hornady XTP (.357 Mag) | 158 grain | Alliant 2400 | 11.3 gr | 14.9 gr | 1,232 fps | 4 inch / Revolver | Lyman 49th Edition |
| Speer JHP (.357 Mag) | 158 grain | Alliant 2400 | 11.2 gr | 12.5 gr | 1,178 fps | Vented Test Barrel | Speer Manual #12 |
| Hornady XTP (.357 Mag Rifle) | 158 grain | Alliant 2400 | 9.3 gr | 13.8 gr | 1,350 fps | 18 inch / Rifle | Hornady Manual |
| Hornady XTP (.44 Mag) | 240 grain | Alliant 2400 | 17.4 gr | 21.2 gr | 1,350 fps | 7.5 inch / Redhawk | Hornady 8th Edition |
| Cast LSWC (.44 Mag) | 250 grain | Alliant 2400 | 18.2 gr | 20.6 gr | 1,290 fps | Vented Test Barrel | Lyman 49th Edition |
| Hornady XTP (.44 Special) | 240 grain | Alliant 2400 | 8.9 gr | 9.9 gr | 750 fps | 3 inch / Revolver | Hornady 4th Edition |
Understanding Hercules 2400 Powder Reloading Data
To safely interpret the data provided above, reloaders must understand the terminology and the unique history of Hercules 2400 powder. Hercules Powder Company transitioned into Alliant Techsystems in the 1990s, but the powder remains fundamentally the same and is now sold as Alliant 2400.
- Starting load: The minimum tested powder charge recommended by the publisher. With Hercules 2400, dropping below this can result in inconsistent ignition and unburned powder granules left in the barrel.
- Maximum published load: The absolute upper limit tested by the manufacturer. Exceeding this limit will cause dangerous pressure spikes.
- Velocity: The speed of the projectile measured in feet per second (fps) near the muzzle.
- Pressure: The chamber pressure generated upon firing. Modern SAAMI limits for magnum handgun cartridges are lower than they were decades ago, changing how maximum charges are published today.
- Bullet weight: The mass of the projectile in grains.
- Powder: The specific chemical propellant. Hercules 2400 is a flake powder known for its versatility in magnum cases.
- Barrel length: The length of the test barrel. Handgun data often uses 4 inch to 7.5 inch vented test barrels, while pistol caliber carbines use 16 inch to 18 inch barrels.
- Test conditions: The exact brass cases and primers used during manufacturer testing.
- Cartridge overall length: The total length of the loaded cartridge. Seating a bullet deeper than published specifications drastically increases chamber pressure.
Hercules 2400 Bullet Weight Reloading Data
Hercules 2400 excels across a wide variety of bullet weights in magnum handgun and small rifle cartridges.
- 158 grain (.357 Magnum): This is the classic application for Hercules 2400. Almost all manuals provide extensive 357 magnum load data for 158 grain jacketed hollow points (JHP) and cast lead semi wadcutters (LSWC). It produces excellent velocity without reaching maximum pressure limits prematurely.
- 240 grain and 250 grain (.44 Magnum): Published 44 magnum load data heavily features Hercules 2400 for 240 grain jacketed bullets and 250 grain hard cast lead bullets. It is highly regarded by hunters for providing deep penetration and excellent accuracy.
- 40 grain and 45 grain (.22 Hornet): In small capacity rifle cases like the .22 Hornet, Hercules 2400 acts as a fast burning rifle powder, pushing lightweight varmint bullets to high velocities safely.
- 110 grain (.30 Carbine): Hercules 2400 is considered a staple powder for reloading the .30 Carbine, successfully cycling the M1 Carbine action while replicating military ballistics.
Hercules 2400 Powder Primers and Combinations
One of the most important aspects of using Hercules 2400 powder reloading data is primer selection.
Unlike many other magnum handgun powders, Hercules 2400 ignites very easily. The manufacturer strongly recommends using standard pistol primers rather than magnum pistol primers for most applications. Using a magnum primer with a published Hercules 2400 maximum load can cause a rapid pressure spike that exceeds safe SAAMI limits. Always follow the specific primer listed in your reloading manual.
Bullet construction also matters. A 158 grain cast lead bullet requires less pressure to push down the barrel than a 158 grain jacketed bullet. Therefore, published powder charge weights will differ between cast and jacketed projectiles of the exact same weight.
Hercules 2400 vs Slower Magnum Powders
Reloaders frequently compare Hercules 2400 to slower burning spherical magnum powders like Winchester 296 (W296) and Hodgdon H110.
W296 and H110 require heavy bullet tension, maximum powder charges, and magnum primers to ignite safely. They cannot be downloaded. If you reduce an H110 charge by more than 3 percent, you risk a dangerous hang fire or a bullet stuck in the bore.
Hercules 2400 is much more flexible. It is slightly faster burning than H110 and can safely be reduced for mid range target loads. While it might leave some unburned flakes in the chamber during light loads, it will reliably ignite and send the bullet downrange. For maximum velocity applications, H110 often yields slightly higher speeds, but Hercules 2400 is considered far more versatile.
Manufacturer Data vs Independent Testing
Reloaders must differentiate between official published load data and independent testing found on internet forums.
- Manufacturer Data: Companies like Speer, Hornady, and Alliant utilize laboratory pressure testing barrels. Their starting and maximum loads are scientifically verified to remain under SAAMI pressure specifications.
- Independent Testing: Forum users often post recipes based on their personal chronographs or historical books. Independent users cannot measure true chamber pressure. Never substitute a forum recipe for an official published load, especially with a magnum powder.
Hercules 2400 Pressure And Safety
Safety dictates that you must use modern reloading manuals when referencing Hercules 2400 reloading data.
In the 1970s and 1980s, older manuals like the Speer #11 listed maximum charges for the .357 Magnum that reached nearly 16.0 grains of 2400. During this era, pressure was measured using the Copper Crusher (CUP) method, and the .357 Magnum pressure limit was higher.
Modern manuals, such as Speer #12 and newer, measure pressure using highly accurate piezoelectric sensors (PSI). The modern SAAMI limit for .357 Magnum was reduced to 35,000 PSI to protect lighter revolver frames. Consequently, modern published maximum loads for Hercules 2400 are noticeably lower than they were 40 years ago. You should never use older, outdated manual data in modern firearms. Always start at the published starting load and work up carefully, checking for sticky extraction or flattened primers.
Best Sources For Hercules 2400 Reloading Data
The safest and most accurate sources for Hercules 2400 specific load data include:
- Alliant Powder Reloader’s Guide: The official manufacturer online data center. It provides the most current specifications for modern components.
- Speer Reloading Manual: Because Speer and Alliant are corporate siblings, Speer manuals feature extensive, highly tested data for 2400 powder across dozens of calibers.
- Lyman 50th Edition Reloading Handbook: The gold standard for reloading data, offering hundreds of exact brass, bullet, and primer combinations for both jacketed and cast bullets.
- Hornady Handbook of Cartridge Reloading: An excellent source for pairing 2400 powder with Hornady XTP projectiles in both handguns and rifles.
FAQs
Where can I find Hercules 2400 reloading data?
Verified Hercules 2400 reloading data is published in modern manuals from Hornady, Speer, Lyman, and online in the Alliant Powder Reloader’s Guide.
Are Hercules 2400 and Alliant 2400 the same powder?
Yes. Hercules Powder Company transitioned to Alliant Techsystems. The powder is now sold as Alliant 2400, but modern published load data for Alliant 2400 applies equally to older stockpiles of Hercules 2400 that have been stored properly.
Does Hercules 2400 require a magnum primer?
No. In most published data, standard pistol primers are recommended for Hercules 2400. Using a magnum primer can cause unsafe pressure spikes unless explicitly called for in a specific manual recipe.
Can I download Hercules 2400 for light loads?
Yes. Unlike slower magnum powders like H110, Hercules 2400 is relatively easy to ignite and can be safely reduced for mid range loads, though it may burn somewhat dirty at lower pressures.
What bullet weights have Hercules 2400 load data?
Hercules 2400 data is heavily published for 158 grain .357 Magnum bullets, 240 and 250 grain .44 Magnum bullets, 110 grain .30 Carbine bullets, and 40 to 45 grain .22 Hornet bullets.
What is the difference between Hercules 2400 and H110?
Hercules 2400 burns slightly faster, uses standard primers, and can be downloaded safely. H110 burns slower, requires magnum primers, requires heavy bullet crimps, and cannot be downloaded safely.
Why is older Hercules 2400 load data different from modern data?
Older manuals used copper crusher (CUP) pressure testing and higher SAAMI limits. Modern data uses highly sensitive piezoelectric (PSI) testing and reflects reduced modern SAAMI pressure limits to protect firearms, resulting in lower maximum powder charges.