Published: 2026 | Last updated: May 2026
Accurate No. 9 is a fast-burning, double-base spherical powder distributed by Western Powders (Accurate) that occupies a specific and well-defined position in the magnum handgun and high-pressure semi-automatic pistol market. It burns faster than Hodgdon H110 / Winchester 296 (position #63 on the Hodgdon chart) and slower than Accurate No. 7 (position #55), placing it at approximately position #60 – the sweet spot for 10mm Auto, 357 Sig, and 357 Magnum maximum-pressure loads where H110 is slightly too slow and No. 7 is slightly too fast.
The powder’s defining characteristics are its high bulk density (0.950 g/cc), ball geometry metering precision, and high energy density from double-base chemistry – three properties that combine specifically well in 10mm Auto, where high case fill at maximum pressures requires a dense, energetic powder that meters consistently on progressive press equipment for defensive and hunting ammunition production.
An important lot-to-lot variance note: The original article includes a “Pro Tip” acknowledging 130-150 fps velocity variation between production batches of Accurate No. 9 – an unusually large lot-to-lot spread. This information is critical for reloaders using this powder for duty, defensive, or hunting loads. Always chronograph loads when starting a new canister and re-verify charge weights if velocity has shifted significantly from your established baseline.
This article is based on published manufacturer specifications, established load data, and documented field reports. Specifications and performance figures can vary between lots, rifles, and conditions. If you have loaded Accurate No. 9 in practice – leave a comment below: real-world experience from the reloading bench is what separates verified data from manufacturer claims.
Powder Description and Technical Profile
Accurate No. 9 is a double-base, spherical powder. The double-base chemistry – nitrocellulose plus nitroglycerin – provides the energy density that allows it to reach SAAMI maximum pressures in the 10mm Auto, 357 Magnum, and 357 Sig cases at charge weights that provide adequate case fill for consistent ignition.
The spherical geometry produces ball powder metering performance – charge-to-charge variance of 0.04-0.07 grains on quality progressive press equipment. For a defensive shooter loading 200-round practice sessions of 10mm Auto or 357 Magnum on a progressive press, this metering consistency eliminates the overhead of scale verification that extruded alternatives in the same burn rate class require.
Bulk density is 0.950 g/cc – high for a magnum handgun powder. In 10mm Auto with 180-grain bullets at maximum charge weights, case fill is approximately 90-97%, eliminating position sensitivity in the semi-automatic pistol’s varying firing positions. In 357 Sig’s small bottleneck case volume, the high density and ball geometry prevent the bridging that extruded powders can show in small-necked cases.
The VMD (volume per mass, 1.053 cc/gram) reflects the high energy density – less volume per grain of charge compared to lower-density alternatives, enabling adequate case fill at working pressures.
The progressive pressure profile builds rapidly but predictably through the 4-6 inch barrel lengths of duty and hunting handguns. The faster burn relative to H110 is an advantage in shorter barrels where peak pressure must be achieved before the bullet has traveled far down the bore.
Strengths:
- Ball geometry metering (0.04-0.07 grain variance) enables high-volume progressive press production of defensive and hunting handgun loads
- High bulk density (0.950 g/cc) produces excellent case fill in 10mm Auto and magnum revolver cases at maximum pressures – minimizes position sensitivity
- High energy density from double-base chemistry drives 10mm Auto 180-grain bullets to 1,200-1,300 fps from 5-inch barrels at appropriate pressures
- Specifically faster than H110 – appropriate for shorter-barreled semi-auto platforms where H110’s slightly slower burn may not reach peak pressure efficiently
- 357 Sig bottleneck case compatibility – ball geometry prevents bridging in the narrow case neck that can affect extruded powders
Limitations:
- Temperature sensitivity of ~1.5 fps/°F – standard double-base ball powder behavior. Loads developed at maximum charge in cool weather can produce elevated pressure in summer heat. The summer/winter pressure variation is specifically important for maximum-pressure defensive and hunting loads
- Lot-to-lot velocity variation up to 130-150 fps – documented in production data and acknowledged in published community reports. Higher than typical for commercial powder. Always chronograph when starting a new canister
- Does not require magnum primers for most applications – unlike H110 which requires magnum primers at all times, No. 9’s lighter deterrent coating ignites adequately with standard magnum pistol primers in most applications; standard primers work in moderate-temperature non-maximum loads
- Double-base flame temperature produces more carbon residue than single-base alternatives in sustained firing sessions
Technical Characteristics
| Property | Specification |
|---|---|
| Manufacturer | Accurate Powders (Western Powders) |
| Type | Double-Base Spherical (Ball) |
| Bulk Density (g/cc) | 0.950 |
| VMD (cc/gram) | 1.053 |
| Grain Shape | Small Spherical |
| Coating | Standard Deterrent |
| Burn Rate Category | Fast Handgun / Magnum |
| Hodgdon Chart Position | ~#60 |
| Temperature Sensitivity | ~1.5 fps / °F |
| Lot-to-Lot Variance | High – chronograph each new lot |
Burn Rate Positioning – The Magnum Handgun Spectrum
Understanding where Accurate No. 9 sits relative to adjacent magnum handgun powders is the key to selecting it correctly:
| Position | Powder | Type | Key Character |
|---|---|---|---|
| #55 | Accurate No. 7 | Double-Base Ball | Faster – 9mm +P, 40 S&W max |
| ~#60 | Accurate No. 9 | Double-Base Ball | Reference – 10mm, 357 Sig, 357 Mag |
| #63 | Hodgdon H110 / Winchester 296 | Double-Base Ball | Slightly Slower – 44 Mag max, 30 Carbine |
| #65 | Hodgdon Lil’Gun | Double-Base Ball | Slower – 410 bore, 454 Casull |
| ~#62 | Alliant 2400 | Double-Base Disc | Similar – broad pressure range, no mag primer |
The key practical distinction from this table: Accurate No. 9 fills the burn rate gap between the 9mm/40 S&W optimized No. 7 and the 44 Magnum / 30 Carbine optimized H110. 10mm Auto and 357 Sig specifically need this intermediate position – faster than H110 for the shorter-barreled semi-auto platforms, slower than No. 7 for the higher case volume.
The Lot-to-Lot Variance Issue
The original article’s “Expert Pro Tip” mentions 130-150 fps velocity variation between production lots of Accurate No. 9. This is worth direct treatment rather than a footnote.
For most commercial powders, lot-to-lot velocity variation is approximately 20-50 fps at the same charge weight in the same cartridge – consistent enough that a validated load from one lot is safely applicable to a new lot with normal monitoring. A 130-150 fps variation between lots is unusually large and has a specific practical implication:
A maximum-pressure load from one lot may exceed SAAMI pressure limits in a new lot if the new lot is more energetic. Conversely, a load tuned to the velocity threshold of a defensive or hunting application may fall short with a new lot.
The management protocol is simple but non-negotiable: when starting a new canister of Accurate No. 9, chronograph your validated load before committing to production. If velocity has shifted more than 30-40 fps from baseline, treat the new lot as a new powder and work up from 5-10% below maximum.
This note applies specifically to 10mm Auto hunters and defensive shooters who load near maximum pressure for terminal performance – the applications where this powder is most used and where the lot variation matters most.
Temperature Sensitivity – Defensive Load Protocol
1.5 fps per degree Fahrenheit is the documented sensitivity of Accurate No. 9 – standard double-base ball powder behavior.
For maximum-pressure 10mm Auto hunting loads, a specific temperature concern arises: a load developed to near-maximum pressure at 55°F will produce elevated pressure at 95°F summer conditions. At 1.5 fps/°F, a 40°F temperature increase adds 60 fps velocity and corresponding chamber pressure increase.
The correct protocol for defensive and hunting loads: validate the final maximum charge weight at the highest temperature the firearm will be carried and fired in. A load validated at 90°F summer conditions is safe year-round. A load validated at cool indoor temperatures and carried in a hot car or summer outdoor carry may exceed design pressure limits.
For 357 Magnum target loads at sub-maximum pressures, the temperature variation is less critical – the safety margin below maximum provides buffer.
| Temperature | [10mm Auto] velocity shift | At 25 yards |
|---|---|---|
| 55°F (winter validation) | Reference | Reference |
| 95°F (+40°F summer carry) | +60 fps | ~0.2″ at 25 yards (negligible) |
| 20°F (-35°F cold weather) | -53 fps | ~0.2″ (negligible) |
Burn Rate Comparison and Competing Powders
vs. Hodgdon H110 / Winchester 296: H110 burns slightly slower and requires near-maximum pressure at all times (Hodgdon’s 3% reduction rule) plus magnum primers in all applications. Accurate No. 9 does not carry the H110 minimum pressure constraint – it works across a broader pressure range and does not require magnum primers for all applications. For 10mm Auto and 357 Sig semi-auto loads where the shorter barrel length favors a faster burn rate, No. 9 is more specifically appropriate. For maximum-velocity 44 Magnum revolver hunting loads at all-maximum pressure where H110’s slightly slower burn sustains pressure through the longer revolver barrel, H110 may produce marginally higher velocity.
vs. Alliant 2400: Alliant 2400 is a disc extruded powder at a comparable burn rate without the minimum pressure requirement, without mandatory magnum primers, and with somewhat better cast bullet compatibility. It meters less consistently than No. 9 from its disc geometry. For cast bullet magnum revolver loads across a range of pressures, Alliant 2400 is more appropriate. For jacketed bullet 10mm Auto and 357 Sig production on progressive equipment, No. 9’s ball metering is the practical advantage.
vs. Accurate No. 7: Accurate No. 7 burns faster and is optimized for 9mm Luger hot loads, 40 S&W competition, and moderate-pressure handgun applications. No. 9 is the correct Accurate choice when case volume increases toward 10mm Auto and 357 Magnum full-power territory where No. 7’s faster burn peaks pressure too early.
vs. Hodgdon Lil’Gun: Hodgdon Lil’Gun burns slower and is specifically designed for 410-bore shotshell and 454 Casull high-pressure revolver applications where longer burn is needed. In 357 Magnum and 10mm Auto, No. 9 is the better burn rate match from its slightly faster speed. Lil’Gun also has better temperature stability than No. 9 (~1.31 fps/°F vs ~1.5 fps/°F) and a slightly broader safe operating pressure range.
vs. Ramshot Enforcer: Ramshot Enforcer is a double-base ball powder at a comparable burn rate. The original article notes it offers “similar metering but often lower top-end velocities” than No. 9 – this is consistent with field reports. Both are legitimate choices for magnum semi-auto and revolver applications; load development in the specific barrel guides the final selection.
Recommended Cartridges and Applications
Accurate No. 9 is specifically suited to high-pressure semi-automatic and magnum revolver cartridges where the burn rate position between No. 7 and H110 provides the best pressure-to-velocity ratio.
| Cartridge | Bullet Weight Range | Application |
|---|---|---|
| 10mm Auto | 155-200 gr | Primary application – hunting and defensive |
| 357 Sig | 115-125 gr | High-velocity bottleneck semi-auto |
| 357 Magnum | 125-180 gr | Maximum velocity hunting and target |
| 41 Remington Magnum | 200-265 gr | Full-pressure hunting revolver |
| 44 Remington Magnum | 200-280 gr | Maximum velocity – verify barrel length |
| 30 Carbine | 110 gr | M1 Carbine cycling |
| 460 S&W Magnum | 250-300 gr | Moderate/target loads only |
| 500 S&W Magnum | 350-400 gr | Moderate/target loads only |
10mm Auto is the application where Accurate No. 9 is most specifically documented and most frequently cited as the preferred choice. With 180-grain jacketed hollow points in a 5-inch barrel at SAAMI maximum pressure, No. 9 consistently produces 1,200-1,300 fps – the velocity range that defines true 10mm Auto performance and separates it from downloaded “10mm Lite” factory ammunition.
357 Sig benefits specifically from the ball geometry’s resistance to bridging in the small bottleneck case neck. Extruded powders can bridge in this narrow neck area, producing inconsistent charges. No. 9’s fine spherical grains flow through the neck-to-body junction consistently.
44 Magnum note: No. 9 is documented for 44 Magnum but H110 / Winchester 296 are historically better documented for maximum-velocity 44 Magnum in long-barreled revolvers (6-8 inches) where the slightly slower burn of H110 sustains pressure longer through the barrel. For shorter 4-inch barreled 44 Magnum revolvers, No. 9’s faster burn may be more appropriate. Verify from current Accurate published data for specific bullet weight and barrel length.
Bullets
Accurate No. 9 produces best results paired with jacketed hollow point and jacketed soft point hunting and defensive bullets in its primary applications. The high peak pressures involved are generally not appropriate for soft cast lead bullets.
| Brand | Model | Weight | Cartridge | Application |
|---|---|---|---|---|
| Hornady | XTP | 155-200 gr | 10mm Auto | Hunting and Defense |
| Speer | Gold Dot | 125-180 gr | 10mm / 357 Sig | Defensive |
| Sierra | Sports Master | 158-240 gr | 357 Mag / 44 Mag | Revolver Hunting |
| Nosler | Partition | 180-240 gr | 10mm / 44 Mag | Premium Hunting |
| Federal | Fusion | 158-180 gr | 357 Mag | Hunting |
| Hornady | XTP | 125-158 gr | 357 Magnum | Hunting and Defense |
| Barnes | TAC-XP | 155-180 gr | 10mm Auto | Lead-Free Defensive |
| Sierra | Sports Master | 125 gr | 357 Sig | Competition |
| Lehigh Defense | Xtreme Penetrator | 174 gr | 10mm Auto | Deep Penetration Hunting |
Have you loaded Accurate No. 9? Your practical data on charge weights, lot-to-lot velocity variation, 10mm Auto hunting results, or temperature behavior helps other reloaders more than any spec sheet. Leave a comment below.
Primers
Accurate No. 9 ignites reliably from small pistol magnum primers in 357 Magnum and 357 Sig applications, and large pistol magnum primers in 10mm Auto, 41 Remington Magnum, and 44 Magnum applications. Unlike H110 which requires magnum primers at all times, standard primers can work for moderate-pressure 357 Magnum and 10mm Auto target loads in moderate temperatures – though magnum primers are generally recommended for maximum-pressure loads and cold-weather use.
| Primer | Type | Application |
|---|---|---|
| CCI 550 | Small Pistol Magnum | 357 Magnum, 357 Sig – primary |
| Winchester WSPM | Small Pistol Magnum | 357 Magnum, 357 Sig |
| Federal 200 | Small Pistol Standard | 357 Sig moderate loads |
| CCI 500 | Small Pistol Standard | 357 Magnum moderate loads |
| CCI 350 | Large Pistol Magnum | 10mm Auto, 41 Rem Mag, 44 Mag |
| Federal 155 | Large Pistol Magnum | 10mm Auto precision |
| Winchester WLP | Large Pistol Standard | 10mm Auto moderate loads |
| CCI 300 | Large Pistol Standard | 10mm Auto moderate-temperature loads |
| CCI 450 | Small Rifle Magnum | 30 Carbine |
| Remington 1-1/2 | Small Pistol Standard | 357 Magnum reduced target loads only |
| Fiocchi Large Pistol | Large Pistol Standard | 10mm alternative |
| Ginex Large Pistol | Large Pistol Standard | Cost-effective 10mm production |
Metering and Equipment Compatibility
Accurate No. 9’s ball geometry is the dominant practical advantage on progressive press equipment. On a Dillon XL 750, Dillon RL 1100, or Hornady Lock-N-Load AP, the Dillon Precision Case Activated Powder Measure Assembly handles No. 9 with near-liquid flow consistency at normal cycling speeds.
Static electricity management: small dense spherical grains accumulate static in plastic hoppers. Ground the drop tube or treat the hopper with an anti-static dryer sheet in dry conditions. Static-induced bridging in the drop tube defeats ball powder’s metering advantage.
For single-stage precision defensive or hunting load development, the RCBS MatchMaster and Hornady Auto-Charge Pro handle the small dense spheres efficiently at 10mm Auto charge weights (6-9 grains).
Reloading Safety Notes
All charge weights must come from current published Western Powders / Accurate load data for Accurate No. 9 specifically. Do not substitute Hodgdon H110, Alliant 2400, or Accurate No. 7 charge weights without independent verification.
Lot-to-lot verification is mandatory with this powder. When starting a new canister, chronograph your validated load before committing to production. If velocity has shifted more than 30-40 fps from your established baseline, treat the new lot as a new powder and work up from 5-10% below your previous maximum.
Temperature protocol: develop maximum-pressure defensive and hunting loads at the highest temperature the firearm will be carried and fired in. A 40°F temperature increase adds approximately 60 fps and corresponding pressure at 1.5 fps/°F.
Start 10% below the listed maximum and work up in 0.2-grain increments. Pressure signs in semi-automatic pistols: stiff slide/bolt operation, flattened primers, ejector marks on case heads. In revolvers: stiff cylinder rotation, gas cutting at the cylinder gap.
See the overpressure in reloading guide for systematic pressure sign identification.
FAQ
Is Accurate No. 9 better than H110 for 10mm Auto?
For 10mm Auto specifically, No. 9’s slightly faster burn rate is a better match for the 5-6 inch semi-auto barrel than H110’s slightly slower burn. H110 also carries the 3% minimum pressure rule and mandatory magnum primer requirement – neither applies to No. 9. For 10mm Auto maximum-pressure hunting and defensive loads, No. 9 is the more specifically appropriate choice. For maximum-velocity 44 Magnum in long-barreled revolvers, H110 produces marginally higher velocity from its slower burn sustaining pressure through the longer barrel.
How much does lot-to-lot variation really matter for target shooting?
For general target shooting where hitting steel plates at 25 yards is the goal, 130-150 fps variation does not affect practical performance. For defensive loads where terminal performance velocity thresholds matter, or for hunting loads where energy at extended ranges is specified, the lot-to-lot variation is meaningful and requires chronograph verification with each new canister. The original article’s Pro Tip on this point is legitimate field guidance.
Can No. 9 be used for cast lead bullets in 357 Magnum or 44 Magnum?
The high peak pressures that No. 9 develops are generally not appropriate for soft cast alloy bullets (BHN 10-14) at full-pressure loads – gas cutting and leading are more likely than with powders that produce a less aggressive initial pressure spike. For cast bullet magnum revolver loads, Alliant 2400 is the more appropriate choice across the full pressure range.
Conclusion
Accurate No. 9 fills a well-defined position: the fast-burning double-base ball powder that is specifically appropriate for 10mm Auto hunting and defensive loads, 357 Sig bottleneck semi-auto loads, and 357 Magnum maximum-pressure applications where the burn rate between No. 7 and H110 is specifically the right choice.
The lot-to-lot variance is the distinctive operational concern – higher than most powders and requiring chronograph verification with each new production batch for maximum-pressure applications. The temperature sensitivity is standard double-base ball powder behavior, manageable with appropriate validation protocol.
Choose Accurate No. 9 if you load 10mm Auto for hunting or high-performance defensive use, 357 Sig at full pressure, or 357 Magnum maximum-velocity loads and want ball powder metering with the specific burn rate that fits these applications. Choose Hodgdon H110 if you load exclusively at maximum pressure with jacketed bullets in 44 Magnum or 357 Magnum and want the most thoroughly documented magnum revolver ball powder. Choose Alliant 2400 if you load cast bullets, prefer a broad pressure range without a minimum-pressure constraint, or do not want mandatory magnum primer requirements. Choose Accurate No. 7 if 9mm Luger +P and 40 S&W competition loads are the primary applications.
Editor’s note: Published load data and manufacturer specifications are the starting point – not the final word. Field experience from reloaders who have actually worked with this powder is the most reliable guide to what it does in practice. If you have used Accurate No. 9, share your results in the comments.
Editorial note: Originally published 2026, revised May 2026. The revision promoted the lot-to-lot velocity variation note from a “Pro Tip” footnote to a dedicated section with specific management protocol given its safety implications for defensive and hunting loads. Added the burn rate positioning table showing No. 9 between No. 7 (#55) and H110 (#63). Added the temperature protocol for defensive and hunting maximum-pressure loads. Added the 44 Magnum barrel length note clarifying when H110 is more appropriate. Added the cast bullet guidance. Extended the competitor comparisons to include Ramshot Enforcer and Hodgdon Lil’Gun. Extended the bullet and primer tables with full internal links. Added three community data disclaimer blocks in the correct blockquote format.
