The introduction of Accurate No. 9 to the reloading community provided a high-performance solution for enthusiasts of traditional magnum handguns and high-pressure semi-automatic cartridges. Engineered as a double-base, spherical propellant, Accurate No. 9 is designed to maximize energy output in cases with limited volume, making it a premier choice for 10mm Auto and 357 Sig. In the 2026 shooting landscape, it remains a staple for those seeking a balance between high velocity and exceptional metering consistency across progressive reloading platforms.
Executive Summary
- Main Application: Optimized for traditional magnum handgun cartridges such as 357 Magnum, 41 Remington Magnum, and 44 Remington Magnum.
- Key Advantage: Exceptional volumetric metering and high case-fill capacity for consistent ignition.
- Burn Rate: Fast-range magnum pistol speed, positioned between Accurate No. 7 and Hodgdon H110.
- What This Guide Covers: Comprehensive technical profile, comparative stability data, and optimized cartridge/bullet combinations for 2026.
Best For: High-volume shooters and handgun hunters requiring maximum performance in 10mm Auto and magnum revolvers.
Powder Description & Technical Profile
Accurate No. 9 is a double-base, spherical propellant that utilizes nitroglycerin to enhance its energy density. Its grains are extremely fine and uniform, which allows the powder to flow through volumetric measures with near-perfect consistency, virtually eliminating the “bridging” common with extruded powders. This physical profile is specifically advantageous for high-volume reloading on progressive presses, where charge weight uniformity is critical for maintaining consistent velocities.
The expert “feel” of Accurate No. 9 is characterized by its high loading density. In cartridges like the 10mm Auto, it provides excellent case fill, which prevents the powder from shifting away from the primer—a common cause of erratic ignition and vertical stringing in large-capacity cases. While it is a high-energy powder, it is also formulated to be clean-burning, reducing residue buildup in both revolvers and semi-automatic actions.
Pros & Cons
- Pros:
- Unrivaled metering precision in both mechanical and automated powder drops.
- Provides class-leading velocities in 10mm Auto and 357 Sig.
- Clean-burning formulation helps extend maintenance intervals for firearms.
- Economical target load potential for large magnums like the 460 S&W and 500 S&W.
- Cons:
- Fast burn rate makes it less suitable for long-barreled rifle applications where slower powders excel.
- Exhibits moderate temperature sensitivity, a characteristic common to double-base spherical powders.
- Can be abrasive to certain older plastic powder reservoirs over long-term contact.
Technical Characteristics
The technical specifications of Accurate No. 9 reflect its role as a high-density, high-energy propellant. The data below is verified for 2026 production standards.
| Property | Specification |
| Grain Type | Spherical (Ball) |
| Base Type | Double-Base |
| Density (Bulk) | 0.950 g/cc (60.9 lbs/ft3) |
| VMD (cc/grams) | 1.053 |
| Coating | Standard Deterrent |
| Primary Application | Magnum Handgun / High-Pressure Semi-Auto |
Burn Rate and Temperature Stability
Accurate No. 9 occupies a specialized slot on the relative burn rate chart, sitting just faster than the traditional “magnum twins,” Hodgdon H110 and Winchester 296. This burn speed allows it to reach peak pressure efficiently in the 4-6 inch barrels typically found on semi-automatic pistols and duty revolvers.
As a double-base ball powder, Accurate No. 9 is subject to environmental temperature fluctuations. While it does not feature the specialized temperature-stable coatings of the Hodgdon Extreme series, it remains predictable within standard operating ranges. General data for double-base spherical powders suggests a velocity variation of approximately 1.5 FPS per degree Fahrenheit. Shooters should be mindful of this when developing maximum-pressure “woods loads” for 10mm Auto, as a load developed in winter may show significant pressure signs during summer use.
Stability Comparison Table
| Powder | Sensitivity Type | Estimated FPS Variation (-20 to 120°F) |
| Hodgdon H110 | Moderate (Standard) | 1.24 FPS/°F |
| Hodgdon Lil’Gun | Moderate (Standard) | 1.31 FPS/°F |
| Accurate No. 9 | Moderate (Standard) | ~1.5 FPS/°F |
Powder Comparison
Choosing Accurate No. 9 over its competitors often depends on the specific requirements for metering and case volume.
- Accurate No. 7: Faster than Accurate No. 9, No. 7 is better suited for high-volume 9mm Luger and 40 S&W loads. Accurate No. 9 is the superior choice for full-power 10mm Auto loads where case fill is paramount.
- Hodgdon H110: Slightly slower and requiring a heavy crimp and magnum primer to burn completely. Accurate No. 9 is often more forgiving and provides better performance in slightly shorter barrels.
- Hodgdon Lil’Gun: Slower than Accurate No. 9, it provides higher velocities in 300 Blackout and 450 Bushmaster but generates significantly more barrel heat.
- Enforcer: A direct rival in the magnum pistol market, Enforcer (manufactured by Ramshot) offers similar metering but often yields slightly lower top-end velocities than the high-energy Accurate No. 9.
Comparison Table
| Powder | Burn Rate Position | Density (g/cc) | Primary Cartridges |
| Accurate No. 7 | 55 | 0.940 | 9mm Luger, 40 S&W |
| Accurate No. 9 | 60 | 0.950 | 10mm Auto, 357 Magnum |
| Hodgdon H110 | 63 | 0.940 | 44 Magnum, 30 Carbine |
| Hodgdon Lil’Gun | 65 | 0.956 | 410 Bore, 300 Blackout |
Applications and Performance
The primary performance advantage of Accurate No. 9 lies in its ability to generate high velocities in high-pressure handgun cartridges. In 10mm Auto, it is widely considered one of the best propellants available, consistently yielding 1,200-1,300 FPS with 180 grain projectiles. In the 357 Magnum, it provides the necessary pressure to achieve true magnum performance with 158 grain bullets while keeping the action significantly cleaner than older-generation ball powders.
Furthermore, Accurate No. 9 excels in 357 Sig applications. Because the 357 Sig is a bottlenecked handgun cartridge with very limited internal volume, the high energy density and smooth metering of Accurate No. 9 allow for maximum performance without the risk of powder bridging in the small neck of the case.
Recommended Cartridges and Applications
Accurate No. 9 is a specialized tool for high-intensity handgun loading, though it also finds use in certain carbine calibers.
| Cartridge | Primary Application |
| 10mm Auto | Maximizing energy for hunting and self-defense. |
| 357 Magnum | Precision target shooting and hunting with medium-weight bullets. |
| 357 Sig | Achieving consistent high velocity in bottlenecked cases. |
| 44 Remington Magnum | High-performance revolver hunting and steel plate competition. |
| 30 Carbine | Consistent semi-auto cycling and target precision. |
| 460 S&W Magnum | Economical target and practice loads for large-frame revolvers. |
Bullets
Because of its fast pressure rise, Accurate No. 9 pairs effectively with projectiles designed for high-impact expansion.
| Brand | Model | Weight Range (Grains) | Recommended Application |
| Hornady | V-MAX | 110-125 | 357 Magnum Varmint/Target |
| Speer | Gold Dot | 125-180 | 10mm Auto and 357 Sig Self-Defense |
| Sierra | Sports Master | 158-240 | Magnum Revolver Hunting |
| Nosler | JHP | 180-200 | 10mm Auto Woods Defense |
| Federal | Fusion | 158 | High-Efficiency 357 Magnum Hunting |
Primers
For consistent ignition of double-base spherical powders like Accurate No. 9, the use of magnum primers is often recommended, especially in cold weather or for maximum-density loads.
| Model | Type | Best Application |
| CCI 550 | Small Pistol Magnum | Optimized ignition for 357 Magnum and 357 Sig. |
| Federal 200 | Small Pistol Magnum | Consistent performance for match-grade 10mm loads. |
| CCI 350 | Large Pistol Magnum | Standard choice for full-power 44 Magnum loads. |
| Federal 155 | Large Pistol Magnum | Preferred for 10mm Auto and 41 Remington Magnum. |
| Winchester WSPM | Small Pistol Magnum | High-volume 357 Sig and 357 Magnum reloading. |
| RWS 4033 | Small Rifle | Specialized use in 357 Sig for high-pressure durability. |
| CCI 450 | Small Rifle Magnum | 30 Carbine loads to ensure complete powder burn. |
| Murom KVB-10mm | Large Pistol | Cost-effective ignition for tactical training. |
| Remington 1-1/2 | Small Pistol | For reduced-pressure 357 Magnum target loads only. |
| CCI 300 | Large Pistol | Standard loads for 10mm Auto in moderate climates. |
Conclusion and Expert Verdict
Accurate No. 9 has solidified its reputation as the “gold standard” for 10mm Auto and small-capacity magnum handgun cartridges. Its combination of flawless metering, high energy density, and clean-burning properties makes it superior to many older propellant designs for modern high-performance handguns. While reloaders must respect its fast burn rate and moderate temperature sensitivity, the consistent results it delivers in 357 Sig and 357 Magnum are unmatched by slower rifle-type powders.
Expert Pro Tip: When loading 10mm Auto with Accurate No. 9, pay close attention to the lot-to-lot variation if you are using older stock. Historic manufacturing shifts (e.g., between the Czech Republic and current USA production) can result in velocity shifts of up to 130-150 FPS with the same charge weight. Always verify your “go-to” load with a chronograph whenever you start a new canister to ensure your duty or woods-defense rounds are performing as expected.
