Published: 2026 | Last updated: May 2026
Hodgdon H110 is a slow-burning, double-base spherical powder that is chemically and physically identical to Winchester 296 – both powders are produced at the same facility to the same specification and sold under different brand labels by the same parent company. Load data is directly interchangeable between them.
It was developed during World War II for the 30 Carbine cartridge, a role it still serves, and subsequently became the dominant magnum handgun powder for 357 Magnum, 44 Magnum, and 454 Casull when loaded at maximum pressure.
The powder’s defining characteristic – and its most important safety constraint – is that it must be loaded at or near maximum pressure for safe, complete combustion. Hodgdon’s published data for H110 explicitly states to never reduce charges more than 3% from the listed maximum. This is not a cautious advisory; it is a hard operational limit from the powder’s heavy deterrent coating. Ignition and combustion below the minimum working pressure produce squibs, erratic pressure spikes, and hangfires. Before loading H110, a reloader must understand and commit to this constraint.
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 Hodgdon H110 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
Hodgdon H110 is a double-base, spherical powder with a heavy deterrent coating on each grain. The coating is the chemical regulatory mechanism that produces the slow burn rate from a powder dense enough to develop adequate pressure in large revolver cases. Each sphere is treated with a thick deterrent layer that requires substantial primer energy to penetrate and initiate consistent combustion. This is why magnum primers are mandatory in all H110 applications – standard primers produce variable deterrent penetration, leading to inconsistent ignition and the erratic pressures that make reduced loads dangerous.
The double-base chemistry provides the high energy density that enables maximum velocities in the heavy-bullet magnum cartridges where H110 is most used. In 44 Magnum with 240-300 grain hunting bullets, the nitroglycerin content allows maximum chamber pressure to develop fully in 4-7.5 inch revolver barrels where single-base alternatives at the same burn rate cannot generate the same velocity.
The spherical geometry produces the metering consistency that defines ball powders. Charge-to-charge variance of 0.04-0.07 grains on quality progressive equipment is achievable with H110 – among the best volumetric metering performance of any magnum powder. For a silhouette shooter or handgun hunter loading hundreds of 44 Magnum rounds per season, this metering precision is a practical production advantage over extruded alternatives.
Bulk density is 0.920-0.940 g/cc – high, consistent with dense ball powder design. In 44 Magnum and 357 Magnum cases at maximum charge weights, H110 fills to near-full case capacity – typically 92-98% case fill. This high case fill is a direct contributor to ignition consistency: the powder column is in firm contact with the primer pocket, reducing position sensitivity even in downward-pointed positions.
Strengths:
- Maximum velocity performance in 357 Magnum, 44 Magnum, and 454 Casull with heavy bullets – the primary reason for its dominant position in these applications
- Exceptional metering (0.04-0.07 grain variance) from spherical geometry – best-in-class for magnum handgun powder metering on progressive equipment
- High bulk density (0.920-0.940 g/cc) produces near-full case fill at maximum charges – excellent position sensitivity resistance and ignition consistency
- = Winchester 296 – chemically identical, load data fully interchangeable; broadest published data coverage of any magnum handgun powder
- 300 Blackout supersonic – well-documented for 110-125 grain bullets at full pressure
- 30 Carbine – original design application, maximum velocity
Limitations:
- Mandatory near-maximum charge loading – Hodgdon’s explicit restriction: never reduce more than 3% from maximum. Reduced loads produce squibs, hangfires, and dangerous erratic pressure. This is a hard constraint, not a caution
- Magnum primers required in all applications – standard primers produce inconsistent deterrent penetration and unreliable ignition
- Not for moderate-velocity or target loads – the minimum pressure requirement makes H110 a maximum-performance-only powder
- Temperature sensitivity as a double-base ball powder (~1.2-1.5 fps/°F) – loads developed at maximum charge at cool temperatures can produce elevated pressure at summer temperatures
- Not appropriate for cast lead bullets at reduced velocities – minimum pressure loads with cast bullets produce leading and inconsistent accuracy; jacketed bullets at maximum pressure are the standard pairing
Technical Characteristics
| Property | Specification |
|---|---|
| Manufacturer | Hodgdon Powder Company |
| Identical to | Winchester 296 |
| Type | Double-Base Spherical (Ball) |
| Bulk Density (g/cc) | 0.920 – 0.940 |
| Grain Shape | Small Spherical |
| Coating | Heavy Graphite and Deterrent |
| Burn Rate Category | Slow Handgun / Fast Rifle |
| Primer Requirement | Large Pistol Magnum or Large Rifle Magnum |
| Minimum Charge | No more than 3% below published maximum |
The 3% Rule – Understanding the Safety Constraint
The 3% maximum reduction rule for H110 is the most important safety specification for this powder and deserves a dedicated explanation rather than a footnote warning.
H110’s heavy deterrent coating requires a specific minimum chamber pressure to be overcome before the full powder column ignites uniformly. At maximum published charge weights, the case fill is 92-98% – the powder is in firm contact with the primer and bullet base, and the pressure event propagates through the column consistently. At maximum pressure, the deterrent coating is penetrated reliably by the magnum primer, and combustion proceeds uniformly.
When charge weight is reduced significantly below maximum, two problems emerge:
Problem 1 – Case fill drops. With 10% less powder, case fill drops to approximately 83-88%. The powder can shift away from the primer pocket in a downward-pointing revolver cylinder, creating inconsistent primer-to-powder contact. Ignition becomes position-dependent.
Problem 2 – Combustion pressure may not fully overcome the deterrent. Below the minimum working pressure, the initial pressure spike from partial ignition may or may not be sufficient to propagate through the remaining powder column. If it does not – squib. If it ignites late and unevenly – erratic pressure spike potentially far exceeding maximum.
The 3% limit exists because Hodgdon’s testing confirmed that within 3% of maximum, combustion remains consistent and safe. Beyond 3% reduction, the consistency breaks down unpredictably. This is not a conservative editorial caution – it is Hodgdon’s own published safety specification.
Practical implication: if you want a 44 Magnum powder for loads across the full pressure range from light target through maximum hunting velocity, H110 is the wrong powder. Use Alliant 2400 or Hodgdon Lil’Gun which do not carry this constraint.
The H110 = Winchester 296 Equivalency
Hodgdon H110 and Winchester 296 are identical powders – same formulation, same manufacturing facility, different brand labels sold by the same parent company. This is the same relationship as Winchester 231 and Hodgdon HP-38.
Load data for one is fully interchangeable with the other. A charge weight of 23.0 grains of H110 in 44 Magnum produces the same pressure and velocity as 23.0 grains of Winchester 296 in the same load. When one label is out of stock, the other is the direct substitute without any charge adjustment.
The combined published data from both labels – available in Hodgdon’s comprehensive online database – represents the broadest published data coverage of any magnum handgun powder. Virtually every bullet weight in every primary magnum caliber is covered.
Burn Rate Comparison and Competing Powders
| Powder | Type | Density (g/cc) | Key Character |
|---|---|---|---|
| Accurate No. 9 | Double-Base Spherical | 0.950 | Faster – 357 Magnum, 10mm |
| Alliant 2400 | Double-Base Disc Extruded | 0.873 | Faster – broad pressure range |
| Hodgdon Lil’Gun | Double-Base Spherical | Medium | Similar – more temperature stable |
| Hodgdon H110 | Double-Base Spherical | 0.930 | Reference |
| Winchester 296 | Double-Base Spherical | 0.930 | Identical – same powder |
| Vihtavuori N110 | Single-Base Extruded | 0.800 | Similar – single-base stable |
| Accurate 1680 | Double-Base Spherical | 0.960 | Faster – 7.62×39, 300 BLK |
| IMR 4227 | Single-Base Extruded | 0.920 | Slower – 300 BLK, single-base |
vs. Alliant 2400: The central comparison for magnum handgun reloaders. Alliant 2400 is a disc extruded powder that burns slightly faster, does not require magnum primers, and works cleanly across a broad pressure range from moderate target loads through maximum hunting velocity. H110 meters better from ball geometry, produces slightly higher maximum velocities in heavy-bullet magnum applications from its slower burn rate, and requires maximum-pressure loading at all times. The choice is direct: if you load only at maximum pressure with jacketed bullets and want the best ball powder metering, H110 is the choice. If you load across a pressure range or with cast bullets, Alliant 2400 is the more appropriate choice.
vs. Hodgdon Lil’Gun: Hodgdon Lil’Gun is a double-base ball powder at a comparable burn rate that was specifically designed to address H110’s temperature sensitivity and minimum pressure limitations. It has better temperature stability and a slightly broader working pressure range than H110. For a 410-bore shotshell loader and 357 Magnum shooter who wants ball powder metering with less thermal sensitivity, Lil’Gun is the more modern alternative. H110 produces higher maximum velocities in 44 Magnum with heavy bullets from its slightly slower burn rate that sustains pressure through long revolver barrels.
vs. Vihtavuori N110: N110 is a single-base extruded powder at a comparable burn rate with substantially better temperature stability (0.4-0.6 fps/°F vs H110’s 1.2-1.5 fps/°F), lower muzzle flash, and does not require magnum primers. It produces somewhat less maximum velocity from single-base energy content. For a precision hunter who shoots year-round across wide seasonal temperatures and prioritizes consistency, N110 is the more appropriate choice. For a silhouette competitor who loads maximum-velocity 44 Magnum at consistent temperatures, H110’s velocity edge and ball metering are more relevant.
vs. Accurate 1680: Accurate 1680 burns faster than H110 and is specifically optimized for 7.62x39mm and 300 Blackout subsonic applications. In some 357 Magnum loads, 1680 has published data, but H110 is better matched to standard 357 Magnum and 44 Magnum maximum loads where the slightly slower burn generates more velocity in long barrels.
Recommended Cartridges and Applications
Hodgdon H110 is exclusively a maximum-pressure application powder for magnum handgun cartridges and specific small-bore rifle cases. Any other application must use a different powder.
| Cartridge | Bullet Weight | Application |
|---|---|---|
| 44 Magnum | 200-320 gr | Primary application – maximum velocity |
| 357 Magnum | 125-180 gr | Maximum pressure only |
| 454 Casull | 250-360 gr | High-pressure hunting |
| 41 Remington Magnum | 200-265 gr | Full-pressure hunting |
| 30 Carbine | 110 gr | Original design application |
| 300 Blackout | 110-125 gr | Supersonic maximum velocity |
| 410-Bore | 1/2 – 11/16 oz | Maximum velocity shells |
357 Magnum with H110 is the premier silhouette and hunting combination for that cartridge – the highest published velocities with 158-180 grain jacketed bullets come from H110 / Winchester 296 data. For target shooting or plinking loads in 357 Magnum, use a different powder.
300 Blackout supersonic with 110-125 grain bullets is a legitimate H110 application. The burn rate is appropriate for supersonic pressure development in the 300 Blackout case with these lighter bullets at full cycling pressure. For 300 Blackout subsonic with 200-220 grain bullets, use Accurate 1680 or Hodgdon CFE BLK.
Bullets
Hodgdon H110 is specifically a jacketed bullet powder in magnum revolver applications. Its minimum pressure requirement makes it inappropriate for cast bullet reduced-velocity loads.
| Brand | Model | Weight | Cartridge | Application |
|---|---|---|---|---|
| Hornady | XTP | 240-300 gr | 44 Magnum | Maximum Hunting |
| Hornady | XTP | 158-180 gr | 357 Magnum | Silhouette / Hunting |
| Nosler | Partition | 250-300 gr | 44 Magnum / 454 Casull | Big Game |
| Nosler | AccuBond | 250-300 gr | 44 Magnum / 454 Casull | Premium Hunting |
| Sierra | Sports Master | 158-240 gr | 357 Mag / 44 Mag | Silhouette Competition |
| Barnes | TSX | 200-275 gr | 44 Magnum / 454 Casull | Lead-Free Hunting |
| Federal | Trophy Bonded | 300 gr | 44 Magnum | Heavy Game |
| Sierra | MatchKing | 110-125 gr | 300 Blackout | Supersonic Precision |
| Hornady | FMJ | 110 gr | 30 Carbine | Target / Service |
Cast lead bullets and H110 do not mix well at maximum pressure or any pressure level where the 3% rule applies. The combination of maximum pressure and soft cast alloy produces excessive leading, bullet deformation, and gas cutting. For cast bullet magnum revolver loading, Alliant 2400, Alliant Blue Dot, or Hodgdon Lil’Gun are more appropriate choices.
Have you loaded Hodgdon H110? Your practical data on charge weights, maximum velocities, temperature behavior, or comparison with Alliant 2400 and Winchester 296 helps other reloaders more than any spec sheet. Leave a comment below.
Primers
Magnum large and large pistol primers are mandatory for Hodgdon H110 in all applications. Standard primers produce inconsistent deterrent coating penetration and unreliable ignition – hangfires, squibs, and erratic pressure spikes. This is not a preference; it is a safety requirement documented in Hodgdon’s published loading data.
| Primer | Type | Application |
|---|---|---|
| CCI 350 | Large Pistol Magnum | 44 Magnum, 357 Magnum, 41 Rem Mag |
| Winchester WSPM | Small Pistol Magnum | 357 Magnum with small primer cases |
| Federal 155 | Large Pistol Magnum | 44 Magnum consistent ignition |
| CCI 550 | Small Pistol Magnum | 357 Magnum small primer brass |
| CCI 250 | Large Rifle Magnum | 454 Casull, 30 Carbine, 300 BLK |
| Federal 215 | Large Rifle Magnum | 454 Casull maximum, 30 Carbine |
| Winchester WLRM | Large Rifle Magnum | 30 Carbine, 300 Blackout |
| Fiocchi Large Pistol Magnum | Large Pistol Magnum | Consistent alternative |
| Ginex Large Pistol Magnum | Large Pistol Magnum | Cost-effective magnum option |
Never substitute standard primers for magnum primers with H110 under any circumstances. The deterrent coating chemistry requires the additional brisance of a magnum primer. A standard primer that happens to ignite the load correctly in one shot does not mean the next shot will behave the same way – inconsistency is the hazard, not just failure.
For 300 Blackout in semi-automatic AR-15 platforms, use a magnum primer with a mil-spec cup like the CCI 250 rather than a standard pistol magnum primer – the harder cup prevents slam-fire from a free-floating firing pin.
Metering and Equipment Compatibility
Hodgdon H110’s spherical geometry is among the best in its class for volumetric metering. On a Dillon XL 750 or Dillon RL 1100 with the Dillon Precision Case Activated Powder Measure Assembly, charge-to-charge variance of 0.04-0.07 grains is achievable at normal cycling speeds – better than any extruded magnum powder.
For silhouette and handgun hunting production, this metering precision makes H110 the most efficient ball powder option for maximum-velocity 44 Magnum and 357 Magnum loads on progressive equipment.
For the Hornady Lock-N-Load AP and Lee Pro 4000, the fine spherical grains handle well at all cycling speeds.
Static electricity management applies as with all ball powders in dry conditions – ground the measure’s drop tube or treat the hopper with an anti-static dryer sheet.
Reloading Safety Notes
The 3% minimum charge rule is Hodgdon’s published safety constraint and is not negotiable. Never reduce H110 charges more than 3% from the published maximum in any application. Reduced loads produce inconsistent combustion leading to squibs and erratic pressure spikes.
Magnum primers are mandatory. Standard primers produce unreliable ignition with H110 in all applications. Never substitute standard primers.
All charge weights must come from current published Hodgdon load data for H110 or Winchester 296 specifically – both labels produce interchangeable data. Do not use Alliant 2400 or Vihtavuori N110 charge weights.
Temperature protocol: loads developed at maximum charge in cool conditions (40-60°F) may produce elevated pressure at summer temperatures (85-100°F). Validate maximum charges at the highest temperature the firearm will encounter.
Start from published maximum (since the 3% rule limits reduction) and watch for pressure signs on the first shots: stiff cylinder rotation, gas cutting at cylinder gap, flattened primers, difficult extraction.
See the overpressure in reloading guide.
FAQ
Is the 3% reduction rule really that strict?
Yes – this is Hodgdon’s published safety specification, not an editorial caution. Below the minimum working pressure for H110, the heavy deterrent coating prevents uniform combustion propagation. The result is unpredictable: some rounds fire normally, some squib, and some produce dangerous erratic pressure spikes from delayed detonation of unburned powder. There is no safe “reduced” H110 load below the 3% threshold. If you want reduced-velocity magnum loads, use Alliant 2400, Hodgdon Lil’Gun, or another powder without this constraint.
Is Winchester 296 exactly the same as H110?
Yes – identical formulation, identical manufacturing source, different label. Load data is fully interchangeable. When H110 is out of stock, Winchester 296 is the direct substitute with no charge adjustment needed.
Can H110 be used for cast lead bullets in 44 Magnum?
Not recommended. At the near-maximum pressures H110 requires for clean combustion, most cast alloy bullets (BHN 12-18) experience significant deformation, gas cutting at the bullet base, and bore leading. For cast bullet 44 Magnum loads across a range of velocities, Alliant 2400 is the more appropriate choice.
Can H110 be used for 300 Blackout subsonic?
No – 300 Blackout subsonic with 200-220 grain bullets requires low charge weights that fall far below the 3% minimum pressure requirement. Using H110 for subsonic 300 Blackout produces dangerous squib conditions. Use Accurate 1680 or Hodgdon CFE BLK for subsonic applications.
Conclusion
Hodgdon H110 occupies an undisputed position as the maximum-velocity magnum handgun powder in North American reloading. The combination of spherical metering precision, double-base energy density, high case fill, and an 80-year competition and hunting record in 44 Magnum and 357 Magnum makes it the default recommendation when maximum performance is the requirement.
The operational constraints – mandatory near-maximum loading, mandatory magnum primers, no cast bullet reduced-velocity loads – define it as a specialist powder rather than a general-purpose magnum propellant. Within those constraints, it performs exactly as its reputation describes.
Choose Hodgdon H110 if you load 44 Magnum, 357 Magnum, or 454 Casull exclusively at maximum pressure with jacketed bullets and want the best ball powder metering with maximum velocity. Choose Alliant 2400 if you load across a range of pressures, use cast bullets, or want to avoid magnum primer requirements. Choose Hodgdon Lil’Gun if you want ball powder metering with better temperature stability and a slightly broader working pressure range. Choose Vihtavuori N110 if year-round temperature stability and single-base bore cleanliness are the priority.
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 Hodgdon H110, share your results in the comments.
Editorial note: Originally published 2026, revised May 2026. The revision added the dedicated 3% rule section with the physical mechanism explaining why reduced loads are dangerous with this specific powder, added the H110 = Winchester 296 equivalency section, corrected the original article’s claim that H110 is “generally effective with cast lead bullets” – it is not appropriate for cast bullets at the reduced velocities cast loading requires, added the 300 Blackout subsonic warning in FAQ, corrected the density figure from 0.920 to the more accurate 0.920-0.940 range, extended the competitor comparisons with specific practical guidance, extended the bullet and primer tables with full internal links, and added three community data disclaimer blocks in the correct blockquote format.
