The development of Alliant Reloder 50 represents a pinnacle in the engineering of ultra-slow burning propellants, specifically tailored to meet the extreme volumetric demands of the 50 BMG and its high-performance derivatives. As extreme long-range (ELR) shooting continues to evolve from a niche interest into a sophisticated discipline, the requirement for a powder that can handle massive payloads while maintaining surgical consistency has never been greater. Alliant Reloder 50 was formulated to bridge the gap between traditional military-grade surplus powders and the high-precision requirements of modern competitive shooters. By utilizing advanced chemical stabilizers and a specific grain geometry, Alliant Reloder 50 provides the sustained pressure necessary to accelerate heavy projectiles over long barrel lengths without the erratic pressure spikes often associated with faster magnum powders.
Executive Summary
- Main Application: Optimized for the 50 BMG and ultra-large capacity cartridges such as the 416 Barrett and 408 CheyTac.
- Key Advantage: Features a proprietary decoppering additive that significantly reduces copper fouling in the large-bore surfaces of ELR rifles.
- Burn Rate: Extremely slow; specifically designed to sit in the same performance window as Hodgdon H50BMG.
- What This Guide Covers: Technical grain architecture, temperature sensitivity profiles, a 4-way market comparison, and optimized component matches for maximum ELR precision.
Best For: ELR competitors, 50 BMG enthusiasts, and long-range tactical shooters who require maximum velocity and reduced maintenance in large-bore platforms.
Powder Description & Technical Profile
Alliant Reloder 50 is a double-base extruded propellant manufactured in Sweden to Alliant’s exacting specifications. The “double-base” designation is crucial in this context; by incorporating nitroglycerin into the nitrocellulose matrix, Alliant Reloder 50 achieves a higher energy density than many single-base alternatives. This allows the reloader to achieve superior velocities in cases where volumetric capacity – even in the massive 50 BMG – can eventually become a limiting factor.
The physical geometry of Alliant Reloder 50 consists of large, perforated sticks. These grains are substantially larger than those found in standard magnum powders like Alliant Reloder 22 or Alliant Reloder 25. The size of the grain is a deliberate engineering choice to control the surface-to-volume ratio, ensuring a progressive burn that peaks late in the firing cycle. This creates a “sustained push” effect, which is essential for heavy 750-800 grain projectiles that require a longer duration of gas expansion to reach stable flight velocities.
The expert “feel” of Alliant Reloder 50 is one of incredible smoothness. Shooters often note that the recoil impulse of a rifle loaded with Alliant Reloder 50 feels less sharp than with surplus military powders, suggesting a more linear pressure curve. Furthermore, the inclusion of a decoppering agent is a transformative feature. In the .508 diameter bore of a 50 BMG, copper buildup can degrade accuracy in as few as 10-15 rounds. The chemical additives in Alliant Reloder 50 help keep this fouling in a soft, easily removable state, extending the shot string before accuracy begins to suffer.
Pros & Cons
- Pro: Highest energy density in its class, providing exceptional velocities for ELR work.
- Pro: Integrated decoppering technology reduces barrel maintenance and preserves accuracy.
- Pro: Outstanding temperature stability for a double-base powder, rivaling the best single-base options.
- Pro: Very high load density ensures consistent ignition and low velocity standard deviations.
- Con: Large grain size requires specialized equipment for accurate metering.
- Con: Very high cost per round due to the large charge weights required (220-250 grains).
- Con: Slower burn rate makes it unsuitable for “smaller” magnums like 300 Winchester Magnum or 7mm Remington Magnum.
Technical Characteristics
The technical profile of Alliant Reloder 50 is defined by its massive scale. It is a propellant built for the largest challenges in the reloading world.
| Attribute | Specification |
| Grain Type | Large Perforated Extruded (Stick) |
| Base | Double-Base (High Energy) |
| Density (g/cc) | 0.940-0.965 |
| Burn Rate Category | Ultra-Slow (50 BMG Class) |
| Shape | Cylindrical Stick |
| Coating | Decoppering and Graphite Finish |
Temperature Stability & Burn Rate Analysis
In the world of ELR, where targets are engaged at 2000 yards and beyond, temperature stability is a non-negotiable requirement. A shift of 30-40 FPS due to the rising midday sun can move a point of impact by several feet at extreme ranges. Alliant Reloder 50 was engineered with this in mind, utilizing a chemical stabilizer package that minimizes the impact of ambient temperature on the burn rate.
Compared to older ball powders or early double-base designs, Alliant Reloder 50 shows a remarkably flat response. Data from competitive shooters suggests a velocity variation of approximately 0.4-0.6 FPS per degree Fahrenheit. While single-base powders like Hodgdon H50BMG have long been the gold standard for stability, Alliant Reloder 50 matches this performance while offering the velocity advantage of a double-base chemistry.
Stability Comparison Table
| Powder | Stability Rating | Typical FPS Variation |
| Alliant Reloder 50 | Excellent | 0.4-0.6 FPS per degree |
| Hodgdon H50BMG | Benchmark | 0.3-0.5 FPS per degree |
| Vihtavuori 24N41 | Very Good | 0.5-0.7 FPS per degree |
| Hodgdon US 869 | Sensitive | 1.0-1.3 FPS per degree |
Powder Comparison
To understand where Alliant Reloder 50 sits in the competitive landscape, it is helpful to compare it against its primary peers in the ultra-magnum and 50-caliber category.
- Hodgdon H50BMG: The primary single-base competitor. While Hodgdon H50BMG is legendary for its extreme temperature stability, Alliant Reloder 50 typically provides a 50-75 FPS velocity advantage in 30-inch barrels due to its higher energy density.
- Vihtavuori 20N29: A high-end European extruded powder. Vihtavuori 20N29 is often cited as the cleanest burning option, but it lacks the specific decoppering additive found in Alliant Reloder 50, which many shooters find essential for long strings of fire.
- Hodgdon US 869: A spherical ball powder that burns even slower than Alliant Reloder 50. While Hodgdon US 869 meters perfectly, it is significantly more temperature sensitive and can be difficult to ignite consistently without a heavy-duty primer.
- Vihtavuori 24N41: A slightly faster-burning alternative in the 50 BMG class. Vihtavuori 24N41 is often the better choice for the 416 Barrett or 408 CheyTac when using slightly lighter bullets, whereas Alliant Reloder 50 is the king of the heavyweights.
Comparison Table: 50-Caliber Propellants
| Powder Name | Burn Rate | Density (g/cc) | Primary Cartridges |
| Vihtavuori 24N41 | Fast-ELR | 0.940 | 416 Barrett, 375 CheyTac |
| Hodgdon H50BMG | Standard-50 | 0.935 | 50 BMG, 416 Barrett |
| Alliant Reloder 50 | Ultra-Slow | 0.955 | 50 BMG, 416 Barrett |
| Vihtavuori 20N29 | Very Slow | 0.960 | 50 BMG, 338 Lapua |
| Hodgdon US 869 | Slowest | 1.010 | 50 BMG, 28 Nosler |
Performance, Metering & Equipment
Because Alliant Reloder 50 is composed of large extruded sticks, it presents a significant challenge for traditional volumetric powder measures. Attempting to use a standard measure will result in the “shearing” of grains, leading to inconsistent charge weights and erratic accuracy. For a powder that requires charges often exceeding 225 grains, precision is paramount.
We highly recommend the use of specialized 50-caliber equipment such as the Hornady Lock-N-Load 50 BMG Powder Measure. This tool features an enlarged hopper and a specific metering insert designed to handle the massive grains of Alliant Reloder 50 without bridging. For those seeking the absolute highest precision for competition, we recommend a high-output digital system such as the RCBS MatchMaster Digital Powder Scale & Dispenser or the RCBS ChargeMaster Link Digital Powder Scale and Dispenser. These units can vibrate the large sticks into the pan with 0.1 grain accuracy, ensuring that every round is identical. For the final grain adjustments, the Frankford Arsenal Powder Trickler remains a staple on the ELR reloading bench.
Fouling management is where Alliant Reloder 50 truly separates itself from the competition. In big-bore rifles, the friction generated by a .50 caliber bullet moving at 2800 FPS is immense. Without a decoppering agent, the bore can become “copper-plated” very quickly. Alliant Reloder 50 significantly mitigates this, allowing shooters to maintain their accuracy through a full 20-30 round competition course of fire without needing to scrub the barrel mid-match.
Recommended Cartridges and Applications
Alliant Reloder 50 is not a general-purpose powder. It is a specialized propellant for the most powerful shoulder-fired small arms in existence.
| Cartridge | Primary Application |
| 50 BMG | The standard application; target, ELR, and military use |
| 416 Barrett | Optimized for 400-450 grain ELR solids |
| 408 CheyTac | Ideal for heavy 400 grain projectiles in long barrels |
| 375 CheyTac | Maximum velocity loads for 400 grain lathe-turned solids |
| 338 Lapua Magnum | Only for ultra-heavy 300 grain bullets in custom long-throat barrels |
| 14.5mm JDJ | Custom “Hand-Cannon” and destructive device loads |
Bullets
When using Alliant Reloder 50, it is essential to pair it with bullets that have a high enough sectional density to resist the slow burn of the powder. Using a bullet that is too light will result in incomplete combustion and massive muzzle blast.
| Caliber | Recommended Weight (Grains) | Recommended Models |
| 375 Caliber | 350-400 | Cutting Edge Lazers, Warner Tool Solids |
| 416 Caliber | 400-450 | Barrett Solid, Hornady A-MAX |
| 50 Caliber | 650-800 | Hornady ELD-Match, Barnes Borerider |
Primers
Igniting a massive charge of 230 grains of Alliant Reloder 50 requires a tremendous amount of energy. A standard large rifle primer is wholly inadequate for this task. 50 BMG primers are massive components designed to withstand high pressures and provide a sustained flame front that can reach the front of the powder column.
- CCI No. 35: The standard civilian and military primer for 50 BMG; highly recommended for Alliant Reloder 50.
- RWS 5333: A premium European magnum primer with incredible consistency.
- Federal 215: Use only in the “smaller” ELR cartridges like 375 CheyTac using Alliant Reloder 50.
- Winchester WLRM: A robust magnum choice for CheyTac-class cases.
- CCI 250: A reliable choice for 338-caliber cases using Alliant Reloder 50.
- Remington 9-1-2M: A consistent alternative for large magnum ignition.
- Fiocchi Large Rifle Magnum: A high-output international primer suitable for ELR.
- Ginex Large Rifle Magnum: Known for its hard cups and intense ignition, ideal for large charges.
Expert Verdict
Alliant Reloder 50 has solidified its reputation as the premier choice for the modern 50 BMG shooter. By providing the velocity advantage of a double-base energy profile with the stability and decoppering benefits typically reserved for high-end tactical powders, Alliant has created a propellant that makes the 50 BMG easier to shoot and maintain. Whether you are competing at the FCSA World Championships or simply exploring the limits of the 416 Barrett, Alliant Reloder 50 offers a technical advantage that is difficult to replicate with any other powder on the market.
Expert Pro Tip: When loading Alliant Reloder 50 in 50 BMG, always ensure you are using a heavy crimp or sufficient neck tension (at least .004-.005). Because the grains of Alliant Reloder 50 are so large, they require a significant amount of initial resistance to ignite uniformly. If neck tension is too light, the primer can actually unseat the bullet before the powder has reached full combustion, leading to erratic velocities and “hang-fires.” A firm grip on the bullet ensures the most consistent pressure start and the lowest standard deviations.