Reliable 50 BMG reloading data can be found in established manuals from Hornady, Barnes, and the Hodgdon Reloading Data Center.Published load data normally includes the specific .510-inch bullet design, extremely slow-burning powder types, massive powder charges, and expected velocities.Common bullet weights covered by published 50 BMG load data range from 647-grain military ball projectiles to 800-grain solid brass match bullets.Results will naturally vary between sources due to differences in bullet profile, exact powder burn rates, brass case capacity, test barrel length (often 45 inches), and ambient atmospheric conditions.
50 BMG 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 |
| Hornady A-MAX | 750 grain | Hodgdon US869 | Not Listed | 250.0 gr | 2,944 fps | 54,000 PSI | CCI 35 / LC | 5.450″ | 45.00″ / Universal | Hodgdon |
| Hornady A-MAX | 750 grain | Hodgdon H50BMG | Not Listed | 233.0 gr | 2,800 fps | 53,800 PSI | CCI 35 / LC | 5.450″ | 45.00″ / Universal | Hodgdon |
| Barnes Solid | 800 grain | Hodgdon US869 | Not Listed | 250.0 gr | 2,895 fps | 53,700 PSI | CCI 35 / LC | 5.630″ | 45.00″ / Universal | Hodgdon |
| Barnes Solid | 800 grain | Hodgdon H50BMG | Not Listed | 225.0 gr | 2,725 fps | 54,100 PSI | CCI 35 / LC | 5.630″ | 45.00″ / Universal | Hodgdon |
| Speer FMJ-BT | 647 grain | Vihtavuori 24N41 | 213.8 gr | 231.5 gr | 2,910 fps | Not Listed | CCI 35 / LC | 5.450″ | 45.00″ / Universal | Vihtavuori |
| Speer FMJ-BT | 647 grain | Vihtavuori 20N29 | 235.6 gr | 256.3 gr | 2,978 fps | Not Listed | CCI 35 / LC | 5.450″ | 45.00″ / Universal | Vihtavuori |
Understanding The 50 BMG Reloading Data
To safely develop a 50 BMG load recipe, handloaders must understand the extraordinary scale and unique variables that dictate performance in this massive anti-materiel cartridge:
- Starting load: The minimum safe powder charge. Reloaders must always begin load development here. Dropping powder charges too low in the enormous 50 BMG case can cause dangerous secondary ignition or detonation.
- Maximum published load: The absolute safe powder limit established by a ballistic laboratory. Exceeding this limit will cause dangerous overpressure, which can be catastrophic given the immense powder volume.
- Velocity: The bullet speed in feet per second (fps) measured at the muzzle. The 50 BMG is specifically designed to push 650-grain to 750-grain bullets to velocities between 2,700 and 2,950 fps.
- Pressure: The 50 BMG operates at a SAAMI maximum average pressure limit of 54,000 PSI (frequently reaching 55,000 PSI in military chambers).
- Bullet weight:The mass of the 0.510-inch projectile in grains.
- Powder: The specific propellant type. The cartridge strictly requires extremely slow-burning rifle powders to maximize performance and prevent the rifle from blowing up.
- Barrel length:Laboratory test barrels for the 50 BMG are universally 45 inches to reflect the original M2 Browning machine gun specifications, though consumer rifles are much shorter.
- Firearm used for testing: Heavy universal receiver test barrels.
- Test conditions: Altitude, humidity, and temperature variables during pressure testing.
- Cartridge overall length (COL): The total length of the loaded cartridge. Standard military ball lengths hover around 5.450 inches, but monolithic solid match bullets frequently exceed 5.600 inches and require single-loading.
Different published sources may produce varying results because they utilize surplus military brass with vastly different internal case volumes, different primers, and varying tight-tolerance match chambers versus loose military machine gun chambers.
50 BMG Bullet Weight Reloading Data
The 50 Browning Machine Gun (BMG) requires specialized .510-inch projectiles that are heavily reinforced to withstand extreme centrifugal forces.
- 647 grain to 660 grain: The traditional military weight replicating M33 Ball or M8 Armor Piercing Incendiary (API) ammunition. These standard Full Metal Jacket (FMJ) boat-tail bullets are excellent for plinking and volume shooting, typically reaching 2,900+ fps.
- 700 grain to 750 grain:The absolute gold standard for precision long-range shooting.The 750-grain Hornady A-MAX or 750-grain Barnes solid bullets boast massive G1 ballistic coefficients (often exceeding 1.050) to retain supersonic speeds at extreme distances.
- 800 grain:The extreme heavyweights. Often turned from solid brass or copper (such as the Barnes Solid or Lehigh solids), these monolithic projectiles maximize the massive powder capacity and are favored by Fifty Caliber Shooters Association (FCSA) competitors for 1,000-yard matches.
Do not assume a 750-grain monolithic solid bullet uses the same powder charge as a 750-grain jacketed lead-core bullet. Solid copper or brass bullets are longer, reduce internal case capacity, and create more bore friction, strictly requiring reduced powder charges.
50 BMG Powder Reloading Data
The 50 BMG case capacity is gargantuan, holding roughly 220 to 250 grains of powder per shot. It relies exclusively on the slowest-burning rifle powders manufactured.
| Powder | Bullet | Bullet Weight | Published Starting Load | Published Maximum Load | Published Velocity | Source |
| Hodgdon US869 | Hornady A-MAX | 750 grain | Not Listed | 250.0 gr | 2,944 fps | Hodgdon |
| Hodgdon H50BMG | Hornady A-MAX | 750 grain | Not Listed | 233.0 gr | 2,800 fps | Hodgdon |
| Vihtavuori 24N41 | Speer FMJ-BT | 647 grain | 213.8 gr | 231.5 gr | 2,910 fps | Vihtavuori |
| Vihtavuori 20N29 | Speer FMJ-BT | 647 grain | 235.6 gr | 256.3 gr | 2,978 fps | Vihtavuori |
Commercially available powders like Hodgdon H50BMG, US869, Alliant Reloder 50, and Vihtavuori 20N29/24N41 are the industry standards. While military surplus powders like WC860 or IMR 5010 are popular for saving money, they vary wildly from lot to lot and demand extremely cautious work-ups.
50 BMG Bullet And Powder Combinations
The exact component combinations determine the safety and reliability of 50 BMG load development.
- Press and Die Requirements: A standard reloading press cannot handle a 50 BMG. The cartridge requires a specialized oversized press (like the RCBS AmmoMaster or Hornady 50 BMG Press) equipped with massive 1.5-inch thread dies.
- Case preparation:Resizing fired military machine-gun brass requires immense physical force.Reloaders must also physically ream or swage out the military primer pocket crimp before seating a new primer.
- Primer choice:The 50 BMG strictly requires a specialized Number 35 (.50 BMG) primer (such as the CCI #35). Standard large rifle primers are far too small and will literally fall into the primer pocket.
- Case capacity and seating depth: Because precision shooters utilize specialized bullets seated extremely long (often touching the rifling), pushing these bullets deeper into the case to fit into a magazine will radically alter the pressure curve.
50 BMG Velocity From Published Data
Published 50 BMG velocity figures depend entirely on the massive 45-inch test barrel utilized by laboratories.
| Bullet | Bullet Weight | Powder | Published Load | Muzzle Velocity | Barrel Length | Firearm | Source |
| Hornady A-MAX | 750 grain | US869 | 250.0 gr (Max) | 2,944 fps | 45.00″ | Universal Receiver | Hodgdon |
| Barnes Solid | 800 grain | US869 | 250.0 gr (Max) | 2,895 fps | 45.00″ | Universal Receiver | Hodgdon |
| Speer FMJ-BT | 647 grain | 20N29 | 256.3 gr (Max) | 2,978 fps | 45.00″ | Universal Receiver | Vihtavuori |
It is crucial to distinguish between manufacturer-published laboratory velocity and independent chronograph testing from standard civilian rifles.
50 BMG Reloading Data By Barrel Length
Barrel length aggressively dictates the velocity a reloader will achieve. The 50 BMG was designed to burn its massive powder column inside a 45-inch barrel. Major reloading publishers universally utilize 45-inch test barrels to establish baseline data.
When a handloader fires a 750-grain A-MAX load (yielding roughly 2,900 fps in the laboratory) out of a civilian 29-inch barrel (like a Barrett M82 or M107), the velocity drops to approximately 2,680 fps.Firing that exact same ammunition through an ultra-compact 20-inch barrel strips the velocity all the way down to 2,380 fps. Reloaders must clearly identify their test firearm and barrel length when verifying ballistic drops, as a short barrel drastically steepens the trajectory at 1,500 yards.
50 BMG Energy And Ballistics
The 50 BMG was meticulously engineered to deliver unprecedented kinetic energy and defeat light armor at extreme distances. Using verified factory ballistic equivalents from a 29-inch civilian rifle:
- 660-grain M33 Ball (at 2,750 fps):
- Muzzle energy: ~11,091 ft-lbs
- Generates roughly ten times the kinetic energy of a standard .308 Winchester.
- 750-grain Hornady A-MAX (at 2,680 fps):
- Muzzle energy: ~11,954 ft-lbs
- G1 Ballistic Coefficient: 1.050
- The incredibly high ballistic coefficient allows the bullet to retain 53% more energy at 1,000 yards than standard M33 ball ammunition, making it the undisputed king of extreme long-range target shooting.
Manufacturer Data vs Independent Testing
When researching a 50 BMG load data chart, handloaders will encounter:
- Manufacturer-published reloading data: Officially pressure-tested in a laboratory using universal receivers to guarantee loads stay safely under the 54,000 PSI limit.
- Independent chronograph testing: Velocities recorded by precision FCSA competitors. This verifies speed and extreme spread but cannot precisely measure internal chamber pressure.
- Surplus Powder Load Reports: Internet forum recipes from shooters using military surplus powders (like WC860). Because surplus powder degrades and varies lot-by-lot, copying an internet powder charge is highly dangerous.
Priority must always remain with official, pressure-tested commercial manufacturer data utilizing fresh commercial powder.
50 BMG Pressure And Safety
Safety is non-negotiable when using 50 BMG reloading data. A catastrophic failure with a 50 BMG can easily be fatal due to the sheer volume of high-pressure gas and shrapnel.
Handloaders must vigilantly inspect fired brass for incipient case head separation. Because military machine guns feature loose chamber tolerances to guarantee feeding in combat, military surplus brass is often heavily stretched when fired. Resizing it weakens the brass web above the case head. Reloaders should check the inside of every case with a bent paperclip to feel for internal grooving before reloading. Furthermore, handloaders must never under-charge a 50 BMG case to create a “reduced load.” A small amount of powder lying flat in a massive case can ignite all at once across the top layer, creating a bore obstruction or secondary explosion.
Best Sources For 50 BMG Reloading Data
The strongest and most authoritative sources for safe 50 BMG load development include:
- Hodgdon Reloading Data Center: Provides extensive, free, pressure-tested online data specifically highlighting H50BMG and US869 for heavy match projectiles.
- Hornady Handbook of Cartridge Reloading: The definitive source for loading the 750-grain A-MAX, offering distinct laboratory-verified powder charges.
- Barnes Bullets Load Data: Provides highly detailed data specifically for their solid brass and monolithic copper .510 projectiles.
- Fifty Caliber Shooters Association (FCSA): The premier governing body and knowledge base for extreme long-range 50 BMG precision handloading.
Common 50 BMG Reloading Data Questions
Where can I find 50 BMG reloading data?
Authoritative data is published directly by Hornady, Barnes, Vihtavuori, and Hodgdon in their respective modern manuals and online data centers.
What powders are used in published 50 BMG data?
Common powders include Hodgdon H50BMG, Hodgdon US869, Vihtavuori 24N41, Vihtavuori 20N29, Alliant Reloder 50, and surplus WC860.
What bullet weights have 50 BMG reloading data?
Published data covers 647-grain military FMJ projectiles up to heavy 750-grain A-MAX and 800-grain monolithic brass match bullets.
What is the best source for 50 BMG reloading data?
The Hodgdon Reloading Data Center and the Hornady manual provide the most rigorously tested laboratory data for commercial powders.
Why does 50 BMG reloading data vary between sources?
Variations occur due to differences in bullet profile, solid monolithic versus lead-core bearing surfaces, differing laboratory chamber tolerances, and the exact lot of surplus or commercial powder.
Does barrel length affect 50 BMG velocity?
Yes, drastically. A 45-inch laboratory test barrel will consistently yield velocities hundreds of feet per second higher than a standard 29-inch or 20-inch civilian rifle 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 50 BMG data?
Pressure-tested data is available directly from major bullet and powder manufacturers, including Hornady, Barnes, and Hodgdon.
Does Hodgdon publish 50 BMG reloading data?
Yes. Hodgdon provides extensive data specifically developed for the cartridge, covering their H50BMG and US869 powders.
Does Hornady publish 50 BMG reloading data?
Yes. Hornady publishes comprehensive load recipes tailored specifically for their .510-inch projectiles, focusing on the 750-grain A-MAX.
Does Nosler publish 50 BMG reloading data?
No. Nosler does not typically manufacture .510-inch 50 BMG projectiles; dedicated data is best sourced from Hornady or Barnes.
Does Alexander Arms publish 50 BMG data?
No. Alexander Arms developed the .50 Beowulf, which is a completely different, much smaller AR-15 cartridge. 50 BMG data is sourced from major powder and bullet manufacturers.