Reliable 400 Legend load data can be found directly from major powder manufacturers and bullet makers, including Hodgdon, Winchester, Barnes, and Hornady. Published load data normally includes the tested bullet weight, bullet profile, powder type, starting powder charge, maximum powder charge, expected muzzle velocity, and measured chamber pressure. The most common bullet weights represented in published .400 Legend reloading data range from 155 grain lightweight jacketed hollow points to 215 grain hunting bullets, with specialized 300 grain bullets used for subsonic applications. Powder manufacturers publish this data specifically for the standard .400 Legend chamber, and using these precise component combinations is critical because the cartridge operates at a maximum average pressure of 45,000 PSI and relies on specific taper crimps to headspace correctly.
400 Legend Load Data
| Bullet | Bullet Weight | Powder | Published Starting Load | Published Maximum Load | Published Velocity (Max) | Pressure (Max) | Test Barrel / Firearm | Source |
| Hornady XTP | 155 gr | Hodgdon H110 | Not published | Not published | 2,551 fps | Not published | 20″ Barrel | Shooting Times |
| Winchester XP | 190 gr | Hodgdon FS-11 | Not published | Not published | 2,379 fps | 45,000 PSI (Max SAAMI) | 20″ Barrel | Hodgdon / Industry |
| Barnes TSX FB | 190 gr | Winchester 296 | Not published | Not published | 2,300 fps (Est) | 45,000 PSI | 20″ Barrel | Barnes Bullets |
| Hornady InterLock | 210 gr | IMR 4227 | Not published | Not published | 2,250 fps (Est) | Not published | 20″ Barrel | Hodgdon Data |
| Winchester PP | 215 gr | Hodgdon Lil’ Gun | 30.0 gr | 33.5 gr | 2,344 fps | 45,000 PSI (Max SAAMI) | 20″ Barrel | Hodgdon / Shooting Times |
| Winchester Open Tip | 300 gr | Accurate 5744 | Not published | Not published | 1,037 fps | Not published | 20″ Barrel | Factory / Subsonic Data |
Understanding The .400 Legend Load Data
Reloading manuals provide data that has been strictly pressure tested in controlled laboratory environments.
- Starting load: The safest baseline powder charge recommended by the publisher. It generates enough pressure for consistent ignition while maintaining a wide margin of safety during your initial .400 Legend load development.
- Maximum published load:The highest powder charge tested that remains within the SAAMI maximum pressure limit of 45,000 PSI for the .400 Legend.
- Velocity: The expected speed of the projectile as recorded by laboratory chronographs during testing.
- Pressure: The internal chamber pressure measured in PSI (Pounds per Square Inch).
- Bullet weight: The physical mass of the projectile in grains.
- Powder: The specific brand and burn rate of the propellant used.
- Barrel length: The length of the test barrel used by the laboratory. Standard test barrels for the .400 Legend are commonly 16 inches or 20 inches to match standard AR-15 and bolt action hunting rifles.
- Test conditions: Laboratories use specifically sized testing equipment, specific brass cases, and specific small rifle primers to gather their data.
Reputable sources publish varying numerical figures because they utilize different brass brands, distinct primer batches, and testing barrels with slightly different internal tolerances.
.400 Legend Bullet Weight Load Data
The .400 Legend was designed to provide straight-wall cartridge hunters with superior energy and range compared to the .350 Legend, utilizing a true .400 inch diameter bullet.
- 155 grain to 180 grain: Typically used for lightweight target loads. Because the .400 Legend utilizes the same .400 inch bullet diameter as the 10mm Auto, reloaders can easily source jacketed pistol bullets like the Hornady XTP for inexpensive practice or high velocity pest control.
- 190 grain: A very popular hunting weight. Ammunition like the Winchester Deer Season XP uses a 190 grain polymer tipped bullet. Published load data allows this weight to easily exceed 2,350 fps for devastating terminal performance on deer.
- 200 grain to 215 grain: The traditional heavy hunting weights for the cartridge. Bullets like the 210 grain Hornady InterLock or 215 grain Winchester Power-Point retain excellent kinetic energy at 200 yards.
- 300 grain: The heaviest practical weight supported by published .400 Legend reloading data, used exclusively for subsonic suppressed applications. These heavy projectiles are typically loaded with fast burning pistol powders to remain under 1,050 fps.
.400 Legend Powder Load Data
Because of its straight-wall case design and moderate capacity, the .400 Legend performs best with slow burning magnum pistol powders and very fast burning rifle powders.
| Powder | Bullet | Bullet Weight | Published Starting Load | Published Maximum Load | Published Velocity | Source |
| Hodgdon H110 | Hornady XTP | 155 gr | Not published | Not published | 2,551 fps | Shooting Times |
| Hodgdon Lil’ Gun | Winchester PP | 215 gr | 30.0 gr | 33.5 gr | 2,344 fps | Hodgdon Data |
| Winchester 296 | Barnes TSX | 190 gr | Not published | Not published | 2,300 fps (Est) | Barnes Bullets |
| IMR 4227 | Hornady InterLock | 210 gr | Not published | Not published | 2,250 fps (Est) | Hodgdon Data |
Load data published for a specific 190 grain bullet profile cannot automatically be used for a different 190 grain bullet. Bearing surface differences create distinct friction levels inside the barrel.
.400 Legend Bullet And Powder Combinations
The exact component combination strictly dictates safe pressures. The .400 Legend case is based on the 6.8 SPC cartridge, expanded to hold a .400 caliber bullet with a minimal taper to aid extraction.
Bullet construction matters heavily. A solid copper monolithic bullet, like the Barnes TSX, is longer than a lead core bullet of the exact same weight. This increased length means the monolithic bullet seats deeper into the brass case, which intrudes on the powder column, reduces internal case capacity, and raises pressure.
Furthermore, the .400 Legend requires a small rifle primer.Reloaders working with factory fired brass must also note that many factory loads utilize crimped primer pockets, which require a reaming or swaging tool before a new primer can be seated. Finally, because the cartridge headspaces on the case mouth, reloaders must apply a taper crimp. A heavy roll crimp will cause the cartridge to slip too deep into the chamber, leading to misfires or dangerous pressure spikes.
.400 Legend Velocity From Published Data
Velocities provided in published manuals serve as a laboratory baseline rather than a universal guarantee.
- Manufacturer published velocity: Generated in heavily controlled test environments using precise universal receivers with 20 inch barrels.
- Independent chronograph testing: Measured by reloaders using production AR-15s or bolt action hunting rifles. It is common for a load rated at 2,350 fps in a manual to yield slightly different numbers depending on the exact bore diameter and gas seal of a specific rifle.
- Ballistic calculator estimates: Software predictions based on bullet weight, powder charge, and barrel length. These are strictly mathematical estimates and do not replace physical chronograph data.
Do not present a software calculated velocity as a verified or measured velocity.
.400 Legend Load Data By Barrel Length
Barrel characteristics radically affect .400 Legend velocity, though the fast burning powders reach peak pressure quickly.
- 20 inch barrels: Often used in laboratory testing and bolt action deer rifles. These barrels extract the maximum possible velocity from powders like H110 or Winchester 296.
- 16 inch barrels: The standard length found on AR-15 platforms chambered in this caliber. Shooters utilizing a 16 inch barrel will experience a minor velocity loss compared to 20 inch laboratory figures.
- Shorter barrels: The cartridge can be used in shorter pistol length barrels for specialized brush hunting, but shooters must expect a massive fireball and a significant drop in muzzle energy.
Always identify the test barrel length associated with any published velocity figure.
.400 Legend Energy And Ballistics
When loaded to its potential, the .400 Legend delivers devastating kinetic energy that surpasses the legendary .30-30 Winchester and the popular .350 Legend at close ranges.
Using published data for a 190 grain bullet leaving a 20 inch barrel at 2,379 fps, the cartridge produces roughly 2,388 foot pounds of muzzle energy. A heavier 215 grain bullet launched at 2,250 fps will generate around 2,416 foot pounds of muzzle energy. Due to the poor ballistic coefficient of short, fat .40 caliber projectiles, the bullet loses velocity and drops rapidly past 200 yards. It is highly effective within 200 yards, where the heavy bullet creates massive wound channels on large deer and feral hogs. Clearly identify the exact bullet and load associated with every ballistic figure.
Standard .400 Legend vs +P Data
It is vital to understand the pressure categories of modern rifle cartridges. There is no official SAAMI specification for .400 Legend +P load data.
- Standard pressure data:The .400 Legend is rated for a maximum average pressure limit of 45,000 PSI.This is higher than pistol cartridges like the 10mm Auto (37,500 PSI) but lower than the parent 6.8 SPC case (55,000 PSI) to ensure safe function with straight walls.
- The +P myth: The .400 Legend does not have a designated +P category. Any secondary source claiming to offer .400 Legend +P load data is publishing overpressure, unsafe, and undocumented recipes.
- Safety warning: Reloaders must never attempt to create +P data by exceeding published maximum charges. Exceeding 45,000 PSI will severely risk destroying the firearm action, rupturing the straight-wall brass case, and injuring the shooter.
Manufacturer Data vs Independent Testing
When researching .400 Legend reloading data, you must prioritize official manufacturer data over user submitted load reports.
Manufacturer data is rigorously pressure tested using advanced piezoelectric transducers to measure exactly what is happening inside the chamber. Independent testing done by consumers generally only measures velocity via a chronograph. A chronograph cannot detect a dangerous pressure spike. An independent tester might achieve extreme velocities and claim a load recipe is safe simply because their specific AR-15 did not blow up, but that does not make it a verified or safe standard.
.400 Legend Pressure And Safety
The .400 Legend requires explicit attention to detail during the reloading process due to its straight-wall case geometry.
Because straight-wall cases headspace on the case mouth, case length is critical. The maximum case length is 1.65 inches. If the brass stretches beyond this, the case mouth will pinch the bullet into the chamber throat, causing catastrophic overpressure. Reloaders must trim their brass consistently. Furthermore, because the cartridge relies on fast burning magnum pistol powders, reloaders must meticulously check powder drops. A double charge of H110 or Lil’ Gun will instantly destroy the firearm. Always begin your .400 Legend load development at the published starting load and work up carefully in small increments.
Best Sources For .400 Legend Load Data
The most reliable sources for verified reloading data include:
- Hodgdon Reloading Data Center:Excellent for online, pressure tested data covering a variety of Hodgdon, IMR, and Winchester powders like H110, Lil’ Gun, W296, and IMR 4227.
- Hornady Handbook: Because the cartridge is relatively new, Hornady is actively adding 400 Legend data to their digital app and future physical handbook editions for their InterLock and XTP bullets.
- Barnes Bullets Data:Provides excellent published parameters and specific bullet designs, like the 190 grain TSX, explicitly built for the .400 Legend velocities.
Common .400 Legend Load Data Questions
Where can I find .400 Legend load data?
Authoritative data is available in the online Hodgdon Reloading Data Center and through bullet manufacturer supplements from Hornady and Barnes.
What powders are used in published .400 Legend data?
Fast burning rifle powders and slow burning magnum pistol powders are standard, including Hodgdon H110, Winchester 296, Hodgdon Lil’ Gun, IMR 4227, and Accurate 5744.
What bullet weights have .400 Legend load data?
Published data exists primarily for 155, 180, 190, 200, 210, 215, and 300 grain bullets.
What is the best source for .400 Legend reloading data?
The Hodgdon Reloading Data Center is currently the most verified and comprehensive source for multiple powder options in this new caliber.
Why does .400 Legend load data vary between sources?
Laboratories use different test barrel lengths, varying brass capacities, distinct small rifle primers, and distinct bullet bearing surfaces.
What is the difference between standard and .400 Legend +P load data?
There is no officially recognized .400 Legend +P load data. The standard cartridge operates at a maximum SAAMI limit of 45,000 PSI, and attempting to load past this is strictly unsafe.
Does barrel length affect .400 Legend velocity?
Yes. A 20 inch test barrel will yield higher velocities and a more complete powder burn than a 16 inch AR-15 carbine barrel.
Can the same powder charge be used with a different bullet?
No. Different bullets of the exact same weight have different lengths and seating depths, requiring specific standard pressure load data.
What is the difference between starting and maximum published load data?
The starting load is a safe baseline for load development, while the maximum load is the absolute highest charge tested that remains within the safe 45,000 PSI pressure limit.
Does Hodgdon publish .400 Legend load data?
Yes, the online Hodgdon Reloading Data Center provides extensive pressure tested data utilizing H110, W296, Lil’ Gun, and other fast burning powders.
Does Hornady publish .400 Legend load data?
Yes, Hornady provides data for their InterLock and XTP bullet lines, primarily accessible through their digital reloading app supplements.
Does Nosler publish .400 Legend load data?
As the cartridge matures, major bullet manufacturers like Nosler are expected to release specific load data for their proprietary straight-wall hunting bullets.
Does Lyman publish .400 Legend load data?
Lyman will likely include the .400 Legend in future editions of their reloading manual, covering both jacketed and cast lead projectiles suitable for straight-wall cases.
Final Verdict
For accurate and safe .400 Legend load data, reloaders must pull recipes directly from authoritative sources like Hodgdon, Winchester, Barnes, and Hornady. It is imperative to compare the exact bullet profile, powder type, and component list before beginning your load development. Because the .400 Legend headspaces on the case mouth and utilizes fast burning magnum pistol powders, reloaders must explicitly avoid any undocumented recipes, ensure exact brass trimming, apply a proper taper crimp, and adhere strictly to published maximum charges. By utilizing verified, laboratory tested load data, reloaders can safely maximize the massive kinetic energy and phenomenal brush hunting capabilities of the .400 Legend cartridge.