Reliable 400 Legend reloading data is available through the Hodgdon Reloading Data Center and manufacturer publications from Winchester and Barnes. Published data typically includes the specific 0.400-inch bullet design, fast-burning powder type, starting and maximum charge weights, expected velocity, and cartridge overall length. Common 400 Legend bullet weights covered by published load data range from 190-grain expanding hunting projectiles up to heavy 300-grain subsonic bullets. Results vary naturally between sources due to differences in bullet profile, brass case capacity, exact powder burn rates, test barrel length, and atmospheric conditions.
400 Legend Reloading Data
| Bullet | Bullet Weight | Powder | Published Starting Load | Published Maximum Load | Published Velocity | Pressure (Max) | Primer & Case | Cartridge Overall Length (COL) | Barrel Length / Firearm | Source |
| Winchester Deer Season XP | 190 grain | Factory Proprietary | Not Listed | Not Listed | 2,379 fps | 45,000 PSI | Small Rifle / Win | 2.260″ | 20.00″ / Universal | Winchester Factory Data |
| Barnes TSX FB | 190 grain | Hodgdon H110 / W296 | Not Listed | Not Listed | Not Listed | 45,000 PSI | Small Rifle / Barnes | 2.260″ | 20.00″ / Universal | Barnes Bullets |
| Barnes Pro-Hunter | 200 grain | Hodgdon Lil’ Gun | Not Listed | Not Listed | Not Listed | 45,000 PSI | Small Rifle / Barnes | 2.260″ | 20.00″ / Universal | Barnes Bullets |
| Winchester Power-Point | 215 grain | Factory Proprietary | Not Listed | Not Listed | 2,250 fps | 45,000 PSI | Small Rifle / Win | 2.260″ | 20.00″ / Universal | Winchester Factory Data |
| Hornady XTP | 155 grain | Unknown | Not Listed | Not Listed | 2,551 fps | Not Listed | Small Rifle / Win | Not Listed | AR-15 Platform | Shooting Times (Independent) |
| Winchester Super Suppressed | 300 grain | Factory Proprietary | Not Listed | Not Listed | 1,037 fps | 45,000 PSI | Small Rifle / Win | 2.260″ | 20.00″ / Universal | Winchester Factory Data |
Understanding The 400 Legend Reloading Data
To safely develop a 400 Legend load recipe, handloaders must understand the specific variables that dictate performance in this modern straight-walled AR-15 cartridge:
- Starting load: The minimum safe powder charge. Reloaders should always begin load development here to establish a safe baseline before incrementally working up.
- Maximum published load: The absolute powder limit tested by a ballistic laboratory. Exceeding this figure risks severe overpressure, which can cause case blowouts or damage the firearm.
- Velocity: The bullet speed in feet per second (fps) measured at the muzzle during laboratory testing.
- Pressure: The 400 Legend operates at a SAAMI maximum average pressure of 45,000 PSI. This is specifically calibrated to function safely within the hoop strength and bolt thrust limits of the standard AR-15 platform.
- Bullet weight: The mass of the 0.400-inch projectile in grains.
- Powder: The specific propellant chemistry. The 400 Legend relies exclusively on fast-burning magnum pistol powders and light rifle powders.
- Barrel length: Test barrels for the 400 Legend are typically 20 inches, mimicking popular bolt-action and modern sporting rifle hunting configurations.
- Firearm used for testing: Universal receiver test barrels or production AR-15 rifles.
- Test conditions: Altitude, humidity, and temperature variables during pressure testing.
- Cartridge overall length (COL): The total length of the loaded cartridge. To remain compatible with standard AR-15 magazines, the 400 Legend has a strict maximum COL of 2.260 inches.
Different published sources may produce varying results because they utilize brass cases with slightly different internal volumes, differing primer brands, and varying test chamber tolerances.
400 Legend Bullet Weight Reloading Data
The 400 Legend utilizes standard 0.400-inch bullets, meaning it shares a projectile diameter with the popular 10mm Auto pistol cartridge. However, hunting bullets are engineered with thicker jackets to withstand the significantly higher rifle velocities.
- 155 grain to 180 grain: Lightweight options primarily utilizing existing 10mm Auto jacketed hollow points (JHPs). These bullets can be driven to extremely high velocities (often exceeding 2,500 fps) and are popular for varmints and target shooting.
- 190 grain: A flagship hunting weight. Winchester’s Deer Season XP and the solid copper Barnes TSX FB (Flat Base) are optimized specifically for the cartridge’s velocity, offering rapid expansion and deep penetration out to 250 yards.
- 200 grain to 215 grain: The traditional, most heavily documented hunting weights. Winchester’s 215-grain Power-Point and Hornady’s 210-grain InterLock provide massive kinetic energy and excellent weight retention on medium-to-large game like whitetail deer and black bear.
- 300 grain: The standard weight for subsonic 400 Legend reloading data. These massive projectiles are specifically designed to remain below 1,050 fps, making them incredibly quiet when fired through a suppressor.
Do not assume a 200-grain pistol bullet utilizes the exact same powder charge as a 200-grain solid copper rifle bullet. Solid copper bullets offer more bore friction, requiring specific load data to maintain safe pressure curves.
400 Legend Powder Reloading Data
The 400 Legend features a straight-walled case measuring 1.650 inches in length and relies heavily on fast-burning magnum pistol propellants to achieve a complete burn.
| Powder | Bullet | Bullet Weight | Published Starting Load | Published Maximum Load | Published Velocity | Source |
| Winchester 296 | Winchester XP | 190 grain | Not Listed | Not Listed | 2,379 fps | Winchester (Factory Equivalent) |
| Hodgdon H110 | Winchester PP | 215 grain | Not Listed | Not Listed | 2,250 fps | Winchester (Factory Equivalent) |
| Hodgdon Lil’ Gun | Barnes Pro-Hunter | 200 grain | Not Listed | Not Listed | Not Listed | Barnes |
| IMR 4227 | Hornady XTP | 155 grain | Not Listed | Not Listed | 2,551 fps | Shooting Times |
Powders like Hodgdon H110, Winchester 296, Lil’ Gun, and Accurate No. 11FS are the industry standard for this cartridge. They ignite reliably, meter consistently, and generate the necessary gas volume to properly cycle an AR-15’s gas system.
400 Legend Bullet And Powder Combinations
The exact component combinations determine the safety and feeding reliability of a 400 Legend load recipe.
- Case design and seating depth:The 400 Legend utilizes a slightly rebated rim (0.422 inches, identical to the 6.8 SPC). The straight-walled case offers very limited internal volume compared to bottleneck cartridges. Seating a long 215-grain bullet just 0.050 inches deeper than the published COL drastically reduces internal case volume and will aggressively spike chamber pressure.
- Primer size:The 400 Legend strictly utilizes Small Rifle primers. Using a Small Rifle Magnum primer is frequently recommended when igniting heavy charges of spherical powders like H110 or W296, particularly in cold hunting conditions.
- Bullet profile and feeding: The AR-15 feed ramps and specific 400 Legend magazines are optimized for polymer-tipped or round-nose soft point bullets. Wide, flat-nosed cast lead bullets may struggle to feed reliably in semi-automatic platforms.
- Crimp: Because the cartridge headspaces on the case mouth, it strictly requires a taper crimp. Applying a heavy roll crimp will buckle the case walls or ruin the headspace, causing the cartridge to seat too deeply into the chamber and resulting in misfires.
400 Legend Velocity From Published Data
Published 400 Legend velocity figures reflect the barrel length utilized by the testing laboratory.
| Bullet | Bullet Weight | Powder | Published Load | Muzzle Velocity | Barrel Length | Firearm | Source |
| Winchester XP | 190 grain | Factory | Factory Load | 2,379 fps | 20.00″ | Universal Receiver | Winchester |
| Winchester PP | 215 grain | Factory | Factory Load | 2,250 fps | 20.00″ | Universal Receiver | Winchester |
| Win Suppressed | 300 grain | Factory | Factory Load | 1,037 fps | 20.00″ | Universal Receiver | Winchester |
It is crucial to distinguish between supersonic loads (which prioritize muzzle velocity for flat trajectories) and subsonic loads (which are intentionally capped below 1,050 fps).
400 Legend Reloading Data By Barrel Length
Barrel length directly impacts the 400 Legend velocity a reloader will achieve. Winchester and other manufacturers established factory ballistics using 20-inch barrels.
Because the cartridge utilizes fast-burning pistol powders, it is highly efficient in shorter barrels. If a handloader fires a 215-grain load yielding 2,250 fps from a 20-inch bolt-action rifle, transitioning to a 16-inch AR-15 carbine will typically result in a modest velocity loss of roughly 100 to 125 fps. Reloaders must clearly identify their test firearm and barrel length when verifying ballistic drops in the field, as shorter barrels will slightly steepen the trajectory past 150 yards.
400 Legend Energy And Ballistics
The 400 Legend was engineered to deliver massive kinetic energy in straight-wall restricted hunting states, outperforming the 350 Legend by a significant margin. Using verified Winchester factory data from a 20-inch barrel:
- 215-grain Power-Point (at 2,250 fps):
- Muzzle energy: 2,416 ft-lbs
- 100-yard velocity: 1,872 fps
- 200-yard velocity: 1,540 fps
- 200-yard energy: 1,132 ft-lbs
At 200 yards, the 400 Legend still carries over 1,000 ft-lbs of kinetic energy, making it an incredibly lethal and ethical cartridge for whitetail deer and feral hogs at medium ranges.
Manufacturer Data vs Independent Testing
When researching a 400 Legend load data chart, handloaders will encounter:
- Manufacturer-published reloading data:Officially pressure-tested in a laboratory using piezo-electric sensors to guarantee loads stay safely under the SAAMI 45,000 PSI limit.
- Independent chronograph testing: Velocities recorded by handloaders or magazine writers using commercial chronographs over real production rifles. This verifies speed but cannot measure internal chamber pressure.
- User-submitted load reports: Internet forum recipes that often ignore COL variations or push past maximum safe pressures.
Independently measured results frequently differ from published data because consumer rifles feature varying chamber tolerances, gas port sizes, and barrel lengths. Priority must always remain with official, pressure-tested manufacturer data.
400 Legend Pressure And Safety
Safety is paramount when using 400 Legend reloading data due to the cartridge’s straight-walled design and AR-15 platform integration.
The standard SAAMI pressure limit is 45,000 PSI. While bolt-action rifles chambered in 400 Legend could theoretically handle higher pressures, reloaders must strictly adhere to this limit because the AR-15 bolt (which utilizes a 6.8 SPC bolt face) cannot withstand excessive bolt thrust without shearing its lugs.
Furthermore, handloaders utilizing ball powders like H110 or W296 must never reduce their powder charges by more than 3% below the published maximum load. These dense powders require high load density to ignite properly; under-charging them can cause erratic ignition or a dangerous squib load.
Best Sources For 400 Legend Reloading Data
The strongest and most authoritative sources for safe 400 Legend load development include:
- Hodgdon Reloading Data Center:Provides the most extensive, free online data specifically highlighting the exceptional performance of Winchester 296, H110, and Lil’ Gun for straight-walled cartridges.
- Winchester Ammunition Data: As the creator of the cartridge, Winchester provides the definitive baseline data for overall lengths, velocities, and pressure limits.
- Barnes Bullets: The absolute best resource for reloaders utilizing lead-free, solid copper TSX bullets, offering highly transparent data.
- Hornady Handbook of Cartridge Reloading: A benchmark source for traditional recipes using Hornady’s InterLock and XTP bullet lines.
Common 400 Legend Reloading Data Questions
Where can I find 400 Legend reloading data?
Authoritative data is available from the cartridge’s creator, Winchester, in upcoming editions of the Hornady Reloading Handbook, and free online via the Hodgdon Reloading Data Center.
What powders are used in published 400 Legend data?
Common powders include Hodgdon H110, Winchester 296, Hodgdon Lil’ Gun, Accurate No. 11FS, and IMR 4227.
What bullet weights have 400 Legend reloading data?
Published data covers 155-grain lightweight pistol bullets up to heavy 300-grain subsonic rifle projectiles, with 190-grain, 200-grain, and 215-grain being the most heavily supported hunting weights.
What is the best source for 400 Legend reloading data Hodgdon?
The official Hodgdon Reloading Data Center provides the most up-to-date and rigorously pressure-tested data for all Hodgdon, IMR, and Winchester brand powders.
Why does 400 Legend reloading data vary between sources?
Variations occur due to differences in bullet profile, solid copper versus lead-core materials, varying seating depths, and differing laboratory chamber tolerances.
Does barrel length affect 400 Legend velocity?
Yes. A 20-inch bolt-action or AR-15 barrel will consistently yield higher velocities than a 16-inch carbine using the exact same load.
Can the same powder charge be used with a different bullet?
No. Different bullet profiles, materials, and bearing surfaces alter internal case capacity and friction, which dramatically changes chamber pressures.
What is the difference between starting and maximum published load data?
The starting load is the safe baseline for working up a new recipe. The maximum load is the highest pressure limit established safely by a ballistic laboratory.
Where can I find pressure-tested 400 Legend data?
Pressure-tested data is available directly from major bullet and powder manufacturers, including Winchester, Hodgdon, Barnes, and Hornady.
Does Hodgdon publish 400 Legend reloading data?
Yes. Hodgdon provides extensive data for their incredibly popular H110, W296, and Lil’ Gun powders on their official online Data Center.
Does Hornady publish 400 Legend reloading data?
Yes. Hornady publishes incredibly comprehensive load recipes tailored specifically for their 0.400-inch projectiles, including their renowned InterLock and XTP lines.
Does Nosler publish 400 Legend reloading data?
Nosler publishes data for their handgun bullets, but dedicated 400 Legend rifle load data is best sourced from Hodgdon or Winchester.
Does Lyman publish 400 Legend reloading data Lyman?
Upcoming editions of the Lyman AR Reloading Handbook are expected to provide extensive pressure-tested data specifically tailored to modern sporting rifles chambered in the 400 Legend.