In the modern history of precision long-range shooting, few propellants carry the tactical pedigree of Alliant Reloder 15. Recognized globally as a premier medium-burn rifle powder, Alliant Reloder 15 earned its legendary status as the primary propellant for the U.S. Military’s M118LR special ball long range sniper ammunition. This distinction cemented its reputation as a “gold standard” for the 308 Winchester and the 223 Remington, providing a sophisticated balance of high energy and consistent internal ballistics.
While the market is flooded with medium-speed propellants, Alliant Reloder 15 continues to be a top choice for competitive shooters and big game hunters who require maximum velocity from standard cases. Whether you are loading match projectiles for a 1,000-yard string or developing a reliable hunting load for a short-action rifle, Alliant Reloder 15 provides the technical efficiency needed to reach the upper limits of performance.
Executive Summary
- Main Application: Optimized for 308 Winchester and 223 Remington, particularly with heavy match projectiles.
- Key Advantage: High energy density that typically yields superior velocities compared to competitors in the same burn bracket.
- Burn Rate: Medium rifle propellant, situated precisely between IMR 4064 and Hodgdon Varget.
- What This Guide Covers: Detailed technical specifications, temperature sensitivity metrics, a 4-way market comparison, and optimized component matching.
Best For: Precision long-range shooters, M118LR clone enthusiasts, and hunters seeking high-velocity loads for medium-bore cartridges.
Powder Description & Technical Profile
Alliant Reloder 15 is a double-base, extruded (stick) propellant. This chemical composition – utilizing both nitrocellulose and nitroglycerin – is the source of its high energy output. The grains are manufactured with a “short-cut” geometry, designed specifically to address the metering issues often found in older, long-grain stick powders like IMR 4064.
The Expert “Feel”
Reloaders often describe the performance of Alliant Reloder 15 as “potent.” It provides a very efficient case fill and a pressure curve that builds rapidly but smoothly. In the rifle, this translates to a firm recoil impulse and high muzzle energy. One of its most notable technical features is the inclusion of a de-coppering agent, which chemically deters the buildup of copper jacket material in the rifling, extending the time between deep cleanings.
Pros & Cons
- Pros:
- High energy density for exceptional muzzle velocities.
- Short-cut grains flow through measures with high consistency.
- Integrated de-coppering agent maintains barrel accuracy.
- Broad versatility across a massive range of short-action calibers.
- Cons:
- More sensitive to temperature fluctuations than “extreme” single-base propellants.
- Can produce more “sooty” carbon fouling than some modern European alternatives.
Technical Characteristics
The technical profile of Alliant Reloder 15 highlights its high-energy double-base construction.
| Property | Specification |
| Manufacturer | Alliant Powder |
| Powder Type | Extruded (Short-Cut Stick) |
| Base | Double-Base |
| Density | 0.925 g/cc |
| Burn Rate Category | Medium Rifle |
| Coating | Graphite Coated with De-coppering Additive |
Temperature Stability & Burn Rate Analysis
While Alliant Reloder 15 is a legendary match powder, its double-base nature makes it more susceptible to ambient temperature changes than single-base propellants like Hodgdon Varget. In technical field testing, Alliant Reloder 15 typically exhibits a velocity shift of approximately 1.0-1.2 FPS per degree Fahrenheit.
For the hunter or tactical shooter operating at standard ranges, this shift is often negligible. However, for the precision competitor, a load developed at 60F may see a significant point-of-impact shift in 100F summer heat. It is critical to stay below maximum pressure limits when developing loads in cooler weather to ensure safety when the mercury rises.
Stability Benchmark Comparison
| Powder Name | Stability Level | Tech Category |
| Alliant Reloder 15 | Moderate | Double-Base Extruded |
| Hodgdon Varget | Extreme | Insensitive Extruded |
| Accurate 2520 | Standard | Double-Base Spherical |
Powder Comparison
Alliant Reloder 15 competes in the heart of the precision rifle market.
- Hodgdon Varget: The primary rival. While Varget is more temperature-stable, Alliant Reloder 15 often produces higher top-end velocities in the 308 Winchester and 223 Remington.
- IMR 4064: A classic alternative. Alliant Reloder 15 has shorter grains and meters much better, but IMR 4064 is often considered more forgiving near max loads.
- Accurate 2520: A spherical competitor. Accurate 2520 meters perfectly but is generally more temperature-sensitive than Alliant Reloder 15.
- Vihtavuori N140: A premium single-base competitor. It burns cleaner than Alliant Reloder 15 but generally lacks the same high-velocity potential.
Competitor Comparison Table
| Powder | Burn Rate | Density (g/cc) | Primary Cartridges |
| Alliant Reloder 15 | Medium | 0.925 | 308 Winchester, 223 Remington |
| Hodgdon Varget | Medium | 0.885 | 308 Winchester, 6.5 Creedmoor |
| IMR 4064 | Medium | 0.910 | 308 Winchester, 30-06 Springfield |
| Accurate 2520 | Medium | 0.970 | 223 Remington, 308 Winchester |
| IMR 4895 | Medium-Fast | 0.890 | 30-06 Springfield, 303 British |
Performance, Metering & Equipment
Metering Consistency
The short-cut grains of Alliant Reloder 15 allow it to flow through equipment like the RCBS Uniflow Powder Measure 3 with a level of precision that approaches spherical powders. Deviations of more than 0.1-0.2 grains are rare. For match-grade consistency, utilizing a RCBS MatchMaster Digital Powder Scale & Dispenser will provide kernel-by-kernel accuracy.
Fouling and Cleanliness
While Alliant Reloder 15 is extremely efficient, the nitroglycerin in the double-base formula can leave behind a soft, black carbon residue. However, the integrated de-coppering agent significantly offsets this by reducing metal fouling in the bore. For those who prioritize cleanliness, a Frankford Arsenal Powder Trickler used with a high-quality scale ensures that your precision loads are physically consistent before firing.
Recommended Cartridges and Applications
Alliant Reloder 15 is incredibly versatile, performing at an elite level in standard and short-action cartridges.
| Cartridge | Primary Application |
| 308 Winchester | Match accuracy with 168-175 grain bullets |
| 223 Remington | Heavy bullets (69-77 grain) for service rifle |
| 6.5 Creedmoor | Balanced performance with 120-130 grain bullets |
| 22-250 Remington | Maximum velocity for varmint hunting |
| 243 Winchester | High-speed loads for light-to-medium bullets |
| 7mm-08 Remington | Excellent case fill for deer hunting loads |
| 35 Whelen | Powerful short-range big game loads |
| 303 British | Modern performance for classic military rifles |
Bullets
To leverage the high energy of Alliant Reloder 15, pair it with projectiles that benefit from its consistent pressure curve.
| Bullet Brand/Model | Recommended Weight | Application |
| Sierra MatchKing | 175 grain (308) | Long-Range Precision |
| Hornady ELD Match | 168-175 grain | Competition Accuracy |
| Nosler Partition | 150-165 grain | Big Game Hunting |
| Berger VLD Target | 168 grain | Precision Match |
| Sierra Tipped GameKing | 130 grain (270) | Hunting Performance |
Primers
Consistent ignition is paramount when using double-base powders like Alliant Reloder 15 to achieve low velocity spreads.
- CCI 200: The standard large rifle primer for general 308 Winchester development.
- Federal 210: Known for extreme sensitivity and consistent “soft” cups.
- Federal GM210M: Gold Medal Match primer for elite precision loads.
- Winchester WLR: Provides a very hot flame, excellent for ensuring complete combustion.
- CCI BR-2: Benchrest quality primer specifically designed for uniform ignition.
- Remington 9-1-2: A reliable all-around performer for hunting applications.
- CCI 400: The standard small rifle primer for 223 Remington applications.
- Federal GM205M: Match-grade small rifle primer for high-precision varminting.
- Fiocchi Large Rifle: A consistent international option for high-volume loading.
Expert Verdict
Alliant Reloder 15 remains a dominant force in the world of tactical and competition reloading. Its historical connection to the M118LR sniper round is no accident; the powder delivers a unique combination of high velocity, manageable pressure, and excellent accuracy. While it requires the reloader to be mindful of ambient temperature shifts, its performance in the 308 Winchester and 223 Remington is difficult to beat.
If your goal is to replicate legendary long-range loads or simply to find a versatile powder that fills nearly every short-action need on your bench, Alliant Reloder 15 is an essential propellant.
Expert Pro Tip: To replicate the original M118LR military specification, focus on the 175 grain Sierra MatchKing projectile. For the ultimate in lot-to-lot consistency, use a sizing die to ensure exactly 0.002″ of neck tension. Because Alliant Reloder 15 is a double-base powder, consistent neck tension helps initiate the burn cycle uniformly, which is the key to achieving the sub-MOA performance this propellant is capable of.
