Alliant Reloder 33 represents the pinnacle of propellant engineering for the extreme long-range shooter and the high-capacity magnum reloader. Originally developed specifically for the 338 Lapua Magnum, Alliant Reloder 33 was designed to address a critical gap in the market: the need for a powder that could push heavy-for-caliber projectiles to velocities previously unattainable with traditional magnum propellants. As a member of Alliant’s high-performance family, Alliant Reloder 33 utilizes advanced chemical stabilization and energy density to ensure that shooters can achieve maximum muzzle energy while maintaining consistent internal ballistics.
Executive Summary
- Main Application: Optimized specifically for ultra-high-capacity cartridges and extreme long-range (ELR) shooting.
- Key Advantage: Delivers significantly higher velocities in the 338 Lapua Magnum than any other powder in its class.
- Burn Rate: Ultra-slow – positioned significantly slower than Alliant Reloder 25 and Hodgdon Retumbo.
- What This Guide Covers: In-depth technical specifications, 4-way market comparison, temperature stability analysis, and comprehensive component matching for primers, bullets, and equipment.
Best For: ELR competitors and specialized magnum hunters utilizing overbore cartridges with high case capacities.
Powder Description & Technical Profile
Alliant Reloder 33 is a double-base extruded powder. The “double-base” designation signifies that it contains a specific concentration of nitroglycerin added to the nitrocellulose base, providing a higher energy yield per unit of weight compared to single-base powders. This high energy density is vital for large-volume cases where case capacity—though massive—can still be a limiting factor when trying to push 300 grain bullets to elite velocities. Physically, Alliant Reloder 33 consists of large, perforated extruded cylinders. This perforated geometry is a deliberate engineering choice; it increases the surface area during the burn, creating a “progressive” pressure curve that continues to push the bullet throughout the entire length of the barrel rather than peaking and falling off rapidly.
The expert “feel” of Alliant Reloder 33 is one of sustained, powerful acceleration. It lacks the violent initial pressure spike seen in faster magnum powders like Alliant Reloder 22. Instead, Alliant Reloder 33 offers a prolonged expansion cycle, which is why it performs best in barrels of 27 inches or longer. In shorter barrels, the powder may not have sufficient time to fully consume its energy potential, leading to excessive muzzle blast and wasted propellant.
Pros & Cons
- Pros:
- The absolute velocity king for the 338 Lapua Magnum.
- High loading density ensures excellent case fill, which promotes lower Standard Deviation (SD) numbers.
- Advanced decoppering additives help minimize bore fouling during long strings of fire.
- Cons:
- Large kernels make precise volumetric metering difficult without specialized equipment.
- Extremely niche application; generally too slow for standard “magnum” cartridges like 7mm Remington Magnum.
- High nitroglycerin content can lead to slightly increased throat erosion in high-volume fire scenarios compared to single-base alternatives.
Technical Characteristics
The technical profile of Alliant Reloder 33 highlights its specialized nature. It is a high-density propellant designed to fill the largest rifle cases currently in production.
| Property | Specification |
| Density (g/cc) | 0.985-1.010 |
| Burn Rate Category | Ultra-Slow |
| Grain Shape | Large Extruded Perforated Cylinder |
| Coating | Specialized Graphite and Decoppering Agents |
| Base Type | Double-Base |
Temperature Stability & Burn Rate Analysis
In the hierarchy of propellants, Alliant Reloder 33 occupies a position near the very bottom of the burn rate chart. While it is not part of the Alliant “TS” (Temperature Stable) line, its chemical composition is remarkably stable for a double-base powder. Reloader consensus suggests that Alliant Reloder 33 exhibits a velocity shift of approximately 1.1-1.4 FPS per degree Fahrenheit. While it is more sensitive than Hodgdon H1000, its high velocity floor means that even with slight temperature-induced variations, it often remains faster than its competitors at their peak performance.
Stability Comparison Table
| Powder | Stability Rating | Technology |
| Alliant Reloder 33 | Moderate-High | High-Energy Double-Base |
| Hodgdon H1000 | Ultra-High | Extreme Series Single-Base |
| Alliant Reloder 25 | Moderate | Standard Double-Base |
Powder Comparison
To understand the utility of Alliant Reloder 33, it must be compared to other propellants used in the heavy magnum and ELR world. It is significantly slower than the standard magnum powders used for decades.
| Powder Name | Burn Rate | Density (g/cc) | Primary Cartridges |
| Hodgdon Retumbo | Faster | 0.920 | 7mm RUM, 300 Win Mag |
| Alliant Reloder 25 | Faster | 0.950 | 300 Weatherby Magnum |
| Alliant Reloder 33 | Subject | 0.985 | 338 Lapua, 300 RUM |
| Alliant Reloder 50 | Slower | 1.020 | 50 BMG, 416 Barrett |
| Hodgdon US 869 | Slower | 1.050 | 30-378 Weatherby, 50 BMG |
Performance, Metering & Equipment
One of the defining characteristics of Alliant Reloder 33 is its physical size. The kernels are substantial, designed to regulate the burn in cases that might hold over 100 grains of powder. This size poses a challenge for traditional reloading equipment.
- Metering Performance: Attempting to throw charges of Alliant Reloder 33 using a standard drum-style powder measure will lead to significant weight variations. The large kernels frequently catch on the edge of the metering insert, causing a “crunch” and leading to inconsistent drops.
- Recommended Equipment: To achieve the precision required for ELR shooting, the RCBS MatchMaster Digital Powder Scale & Dispenser or the Frankford Arsenal Intellidropper 2.0 Digital Powder Scale and Dispenser are essential. These units bypass mechanical shearing by dispensing individual kernels.
- Fouling Analysis: Alliant Reloder 33 burns very cleanly when operated at its intended pressure levels (55,000-63,000 PSI). Using a Frankford Arsenal Powder Trickler to fine-tune each charge is highly recommended to maintain the consistency needed for long-range accuracy.
Recommended Cartridges and Applications
Alliant Reloder 33 is not a general-purpose powder. It is a specialist propellant that requires massive case volumes to function efficiently.
| Cartridge | Primary Application |
| 338 Lapua Magnum | Maximum velocity for 285-300 grain projectiles |
| 300 RUM | ELR performance with 215-230 grain bullets |
| 300 Norma Magnum | Advanced long-range precision competition |
| 26 Nosler | Ultra-flat trajectory for extreme long-range hunting |
| 30-378 Weatherby Magnum | Taming the massive capacity of the 378-based case |
| 7mm RUM | Pushing high-BC 180-195 grain projectiles |
Bullets
When using Alliant Reloder 33, the goal is almost always to utilize high-BC (Ballistic Coefficient), heavy-for-caliber bullets. Light bullets will often exit the barrel before the ultra-slow Alliant Reloder 33 can build sufficient pressure for a clean burn.
- 30 Caliber: 210-230 grain Match or Hunting bullets.
- 338 Caliber: 250-300 grain projectiles (e.g., Sierra MatchKing, Hornady ELD-M).
- 7mm Caliber: 180-197 grain specialized long-range bullets.
- 26 Caliber: 150-160 grain heavy projectiles.
Primers
Igniting 80-110 grains of ultra-slow powder requires the most powerful ignition source available. A standard large rifle primer is insufficient for Alliant Reloder 33; only a dedicated Magnum primer should be used to ensure consistent ignition and prevent hangfires in cold weather.
- CCI 250 Magnum Large Rifle Primer
- Federal 215 Magnum Large Rifle Primer
- Winchester WLRM Magnum Large Rifle Primer
- Remington 9-1-2M Magnum Large Rifle Primer
- RWS 5333 Magnum Large Rifle Primer
- Fiocchi Large Rifle Magnum Primer
- Ginex Large Rifle Magnum Primer
- Federal GM215M Gold Medal Magnum Primer
Expert Verdict
Alliant Reloder 33 is an uncompromising propellant. It does not aim for versatility; instead, it aims for absolute dominance in the ultra-magnum and ELR categories. For the shooter who demands the highest possible muzzle velocity from the 338 Lapua Magnum or the 300 RUM, there is no substitute. Its ability to maintain high pressures throughout long barrels makes it the engine of choice for those pushing the boundaries of the 1,500-2,000 yard mark.
Expert Pro Tip: When loading Alliant Reloder 33, the importance of case fill cannot be overstated. This powder performs its best when case fill is between 95-102% (slightly compressed). If your load leaves too much air gap in a massive magnum case, your velocity spreads will likely increase. For the most consistent results, use a high-quality priming tool like the Forster Co-Ax Bench Priming Tool to ensure that your magnum primers are seated to a perfectly uniform depth. This consistency in ignition is the foundation upon which the high-velocity potential of Alliant Reloder 33 is built.
