Published: 2026 | Last updated: May 2026
Hodgdon H4350 is a medium-slow-burning, single-base short-cut extruded powder manufactured by ADI (Australian Defence Industries / Thales Group) in Australia and distributed by Hodgdon in North America as a flagship member of the Extreme series. It is the most widely used powder in the 4350 burn rate class, the standard choice for 6.5 Creedmoor precision loading, and the benchmark against which every competing medium-slow rifle powder is measured in terms of temperature stability.
The Extreme series designation is the defining property of H4350: verified velocity variation of 0.14-0.5 fps per degree Fahrenheit across a -40°F to +120°F temperature range, documented across millions of rounds over decades. That 160°F operating range encompasses every practical shooting condition in North America – from deep-winter elk hunting in Montana to summer desert competition in Arizona – and within it, H4350 maintains essentially the same velocity without seasonal load recalculation. This is the property that has made it the first choice among competitive precision rifle shooters who cannot afford vertical dispersion from seasonal velocity shifts at 800+ yards.
The honest picture includes the limitations. H4350 does not produce the highest velocity in the 4350 class – double-base alternatives like Alliant Reloder 16 produce 40-60 fps more at comparable pressures. It is reliably supply-constrained during peak demand periods. And the “88% of professional precision rifle shooters” claim in the original article is not supported by verifiable survey data – it is marketing language that should not be treated as a factual specification. H4350 earns its position on performance, not statistics.
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 H4350 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 H4350 is a single-base, short-cut extruded powder manufactured by ADI in Australia. The ADI manufacturing relationship is the source of the Extreme series technology: ADI produces propellants to Australian and NATO defense specifications, and the chemical stabilizer packages that produce Extreme series temperature performance derive from that manufacturing heritage.
The single-base formulation – nitrocellulose without nitroglycerin – is the first layer of the stability advantage. Single-base chemistry produces a more predictable energy release as temperature changes because only one reaction rate is involved, versus the interactive rates of nitrocellulose and nitroglycerin in double-base formulations. The Extreme series stabilizer coating builds on this foundation, chemically regulating the powder’s burn rate as temperature changes rather than allowing it to shift with ambient conditions.
The short-cut grain geometry is the practical improvement that separated modern H4350 from earlier extruded powder formulations. Traditional long-stick extruded powders bridge at the measure drum edge and shear during metering cycles. Short-cut grains reduce both failure modes, producing charge-to-charge variance of approximately ±0.1-0.15 grains on quality equipment. This is not ball powder metering performance, but it is a meaningful improvement over long-stick alternatives and enables progressive press precision rifle production that was difficult before the short-cut reformulation.
Bulk density is approximately 0.860 g/cc – lower than some 4350-class competitors like Accurate 4350 at 0.920 g/cc and IMR 4451 Enduron at 0.909 g/cc. In 6.5 Creedmoor with 140-143 grain bullets, H4350 typically produces 93-98% case fill at working charge weights – the range where consistent ignition and low standard deviations are achievable.
The progressive pressure curve builds linearly through the charge weight range. Experienced reloaders consistently report that pressure signs with H4350 appear gradually rather than abruptly, providing clear feedback during load development before reaching dangerous territory.
Strengths:
- Extreme series temperature stability (0.14-0.5 fps/°F) across -40°F to +120°F – the verified benchmark for the 4350 burn rate class across the widest seasonal range of any Extreme series powder
- Deepest published data library in the 4350 class – more cartridges, more bullet weights, more manual coverage than any competitor
- Short-cut geometry meters at ±0.1-0.15 grains on quality equipment – improved over long-stick extruded predecessors
- ADI manufacturing quality – tight lot-to-lot consistency from defense-standard manufacturing controls
- 6.5 Creedmoor benchmark powder – the starting point for virtually every 6.5 Creedmoor precision load development recommendation in North American manuals and competition communities
- Single-base clean burning – less carbon residue than double-base alternatives at the same burn rate
Limitations:
- Lower bulk density (0.860 g/cc) than some competitors – Accurate 4350 and IMR 4451 Enduron provide higher case fill at comparable pressures in some applications
- Lower velocity ceiling than double-base alternatives – Alliant Reloder 16 produces 40-60 fps more velocity at the same pressure; the single-base energy trade-off is real
- Consistent availability constraints during peak demand – the most popular precision rifle powder in North America sees supply limitations whenever demand spikes; inventory planning is not optional
- No decoppering additive – unlike IMR 4451 Enduron, H4350 does not carry integrated copper fouling reduction chemistry
Technical Characteristics
| Property | Specification |
|---|---|
| Manufacturer | Hodgdon Powder Company (Manufactured by ADI/Thales, Australia) |
| Series | Hodgdon Extreme |
| Type | Single-Base Short-Cut Extruded |
| Bulk Density (g/cc) | ~0.860 |
| Grain Type | Short-Cut Stick |
| Burn Rate Category | Medium-Slow Rifle |
| Temperature Stability | 0.14-0.5 fps / °F (-40°F to +120°F) |
The Extreme Series Technology – What the Numbers Actually Mean
The 0.14-0.5 fps per degree Fahrenheit stability range for H4350 requires honest contextualization to be useful rather than just impressive.
The figure is verified over the -40°F to +120°F range – 160 degrees of temperature spread. A load that chronographs 2,750 fps at 70°F will produce approximately:
- At -20°F (90°F colder): 2,750 – (90 x 0.32) = approximately 2,721-2,739 fps depending on where in the 0.14-0.5 range the specific lot falls
- At 110°F (40°F warmer): 2,750 + (40 x 0.32) = approximately 2,763-2,770 fps
The total variation across the full practical shooting range from deep winter cold to summer desert heat is less than 50 fps – and typically under 30 fps for most real-world conditions.
For a 6.5 Creedmoor shooter at 800 yards, 30 fps velocity variation produces less than 1.5 inches of vertical deviation. That 1.5 inches at 800 yards is within the first-ring standard of most PRS targets. The Extreme series stability claim at long range is legitimate.
The comparison that makes the stability meaningful in practice: Alliant Reloder 16 at ~0.5 fps/°F is somewhat more sensitive. Accurate 4350 at ~1 fps/°F produces 3x more seasonal variation. IMR 4350 at 1.5-2.0 fps/°F produces 10x more variation. The Extreme series designation is not marketing for this powder – it reflects a measured, verified property.
| Powder | Stability | -40°F to +120°F total | At 800 yards |
|---|---|---|---|
| Hodgdon H4350 | 0.14-0.5 fps/°F | <30 fps | <1.5″ |
| IMR 4451 Enduron | <15 fps total | <15 fps | <1″ |
| Alliant Reloder 16 | ~0.5 fps/°F | ~80 fps | ~4″ |
| Accurate 4350 | ~1 fps/°F | ~160 fps | ~8″ |
| IMR 4350 | ~1.5-2.0 fps/°F | ~240-320 fps | >12″ |
Burn Rate Comparison and Competing Powders
| Powder | Type | Density (g/cc) | Key Character |
|---|---|---|---|
| IMR 4166 Enduron | Single-Base Short-Cut | 0.895 | Slightly Faster – 308 Win, 6.5 Creedmoor light |
| Alliant Reloder 16 | Double-Base Extruded | 0.930 | Similar – higher velocity, moderate stability |
| Hodgdon H4350 | Single-Base Short-Cut Extruded | 0.860 | Reference – Extreme benchmark |
| IMR 4451 Enduron | Single-Base Short-Cut | 0.909 | Similar – Enduron stability + decoppering |
| Accurate 4350 | Single-Base Short-Cut | 0.920 | Similar – standard stability, better case fill |
| IMR 4350 | Single-Base Extruded | 0.850 | Similar-Faster – long sticks, deep data |
| Winchester StaBALL 6.5 | Double-Base Spherical | ~1.000 | Similar – ball metering, partial stability |
| Norma 203B | Single-Base Extruded | 0.895 | Similar – European, 6.5-284 heritage |
vs. IMR 4451 Enduron: The most technically complete comparison. IMR 4451 adds integrated decoppering chemistry and Enduron-specific stability in the same short-cut single-base format. Its <15 fps total stability is even tighter than H4350’s <30 fps. H4350 has the deeper published data library and longer verified track record. Charge weights are not interchangeable – the density difference (0.909 vs 0.860 g/cc) means IMR 4451 data does not transfer to H4350. For new load development where the decoppering benefit matters and the premium is acceptable, IMR 4451 is worth developing alongside H4350. For existing verified H4350 loads, there is no compelling reason to switch.
vs. Alliant Reloder 16: Reloder 16 is double-base and produces 40-60 fps more velocity at the same pressure. Its moderate stability (~0.5 fps/°F field estimate) is substantially better than IMR 4350 but does not match H4350’s Extreme series credentials. For a hunter who specifically wants maximum velocity in 6.5 Creedmoor and shoots primarily in one season, Reloder 16 is a legitimate velocity-priority alternative. For year-round competition where seasonal zero consistency is the primary requirement, H4350 is the more appropriate choice.
vs. Accurate 4350: Accurate 4350 has higher bulk density (0.920 g/cc vs 0.860 g/cc) for better case fill and the same single-base cleanliness, but lacks the Extreme series stability additive package (~1 fps/°F vs H4350’s 0.14-0.5 fps/°F). It is a valid alternative when H4350 is unavailable, with independent load development required from its own data.
vs. Winchester StaBALL 6.5: StaBALL 6.5 is a double-base ball powder with temperature-stabilizing additives and decoppering chemistry. Its ball geometry meters better than any extruded powder at progressive press cycling speeds. Its stability (~0.5-0.8 fps/°F from StaBALL additives) does not match H4350’s Extreme series performance. It produces more velocity from double-base chemistry. For high-volume progressive press loading where metering efficiency is the priority, StaBALL 6.5 is a legitimate alternative. For single-stage precision loading with maximum seasonal consistency, H4350 retains the advantage.
vs. IMR 4350: IMR 4350 is the historical powder at this burn rate position with the largest published data library of any 4350-class powder. It shows 1.5-2.0 fps/°F sensitivity – substantially more than H4350. Long-stick geometry meters less consistently. For a reloader with verified IMR 4350 loads who loads at consistent temperatures, there is no urgent reason to switch. For a new reloader starting development, H4350 is the more modern and seasonally stable choice.
Recommended Cartridges and Applications
Hodgdon H4350 serves the full 4350 burn rate application range with Extreme series stability. It is the starting point for 6.5 Creedmoor load development in virtually every published North American reloading manual.
| Cartridge | Bullet Weight Range | Notes |
|---|---|---|
| 6.5 Creedmoor | 120-143 gr | Primary precision application |
| 270 Winchester | 130-150 gr | Standard hunting weights |
| 30-06 Springfield | 150-180 gr | Full hunting weight range |
| 25-06 Remington | 90-120 gr | Varmint through deer |
| 243 Winchester | 80-105 gr | Hunting and varmint |
| 280 Remington | 140-162 gr | Mountain hunting |
| 7mm-08 Remington | 140-162 gr | Precision hunting |
| 7mm Remington Magnum | 154-175 gr | Standard hunting weights |
| 300 Winchester Magnum | 150-180 gr | Standard hunting weights |
| 6.5 PRC | 130-143 gr | Precision hunting |
| 22-250 Remington | 55-69 gr | Heavy varmint and predator |
| 338 Winchester Magnum | 200-225 gr | Standard hunting loads |
The 6.5 Creedmoor with 140-143 grain match bullets is the application that defines H4350’s modern reputation. The combination of the cartridge’s rising dominance in precision rifle competition and H4350’s Extreme stability created a pairing that has been cited in competition wins from the highest-level PRS events to local club matches for over a decade. With a Hornady 143-grain ELD-X or Sierra 140-grain MatchKing, H4350 produces 2,750-2,820 fps from a 24-inch barrel at appropriate pressures with single-digit standard deviations in well-developed loads.
The Availability Problem – Practical Inventory Planning
H4350’s consistent supply constraints deserve specific treatment rather than a passing mention. The powder is both the most popular medium-slow rifle powder in North America and the one most likely to be unavailable precisely when it is needed most – before hunting season and before major matches.
The practical approach for competition shooters and hunters who depend on verified H4350 loads:
Build a seasonal inventory reserve. A competitive shooter firing 3,000 rounds per year at 50 grains per round uses 150,000 grains – approximately 21.4 pounds of H4350 annually. Purchasing 30+ pounds in a single lot when supply is available provides both quantity reserve and lot consistency through a competitive season.
Identify a verified alternative. Every serious H4350 user should have a tested fallback – either IMR 4451 Enduron or Accurate 4350 with independently developed load data for the same cartridge and bullet. Having verified alternative data means a supply disruption doesn’t require starting load development from scratch when other resources are limited.
Bullets
Hodgdon H4350 produces best results with high-BC, standard to heavy-for-caliber precision and hunting bullets across its primary bore sizes.
| Brand | Model | Weight | Cartridge | Application |
|---|---|---|---|---|
| Hornady | ELD-M | 140-147 gr | 6.5 Creedmoor / 6.5 PRC | Long-Range Match |
| Hornady | ELD-X | 143-156 gr | 6.5 Creedmoor / 6.5 PRC | Long-Range Hunting |
| Sierra | MatchKing | 140-150 gr | 6.5 Creedmoor | Competition |
| Sierra | Tipped MatchKing | 140-150 gr | 6.5 Creedmoor | Long-Range Match |
| Berger | Hybrid Target | 130-153 gr | 6.5 Creedmoor | ELR Competition |
| Berger | VLD Hunting | 140-156 gr | 6.5 Creedmoor / 6.5 PRC | Long-Range Hunting |
| Lapua | Scenar-L | 136-155 gr | 6.5 Creedmoor | Competition Match |
| Nosler | AccuBond | 130-165 gr | 270 Win / 30-06 | Bonded Hunting |
| Nosler | Partition | 130-180 gr | 270 Win / 30-06 | Classic Big Game |
| Barnes | LRX | 127-168 gr | 6.5 Creedmoor / 270 Win | Lead-Free Long Range |
| Sierra | GameKing | 130-175 gr | 270 Win / 30-06 | Traditional Hunting |
Have you loaded Hodgdon H4350? Your practical data on charge weights, accuracy nodes, temperature behavior, or comparison with Reloder 16 and IMR 4451 helps other reloaders more than any spec sheet. Leave a comment below.
Primers
Hodgdon H4350 as a single-base powder ignites reliably from standard large rifle primers in all primary applications under normal conditions. Magnum primers are not required and can produce elevated pressure with a single-base Extreme series powder. In conditions below -10°F (-23°C) or at minimum charge weights where case fill is less than 90%, standard magnum primers provide additional ignition assurance.
| Primer | Type | Application |
|---|---|---|
| Federal GM210M | Large Rifle Match | Competition precision – gold standard |
| CCI BR-2 | Large Rifle Benchrest | Competition lowest extreme spread |
| CCI 200 | Large Rifle Standard | General load development |
| Winchester WLR | Large Rifle Standard | Hunting loads, general use |
| Federal 210 | Large Rifle Standard | Match-grade consistency |
| Remington 9-1/2 | Large Rifle Standard | Standard precision loads |
| CCI 250 | Large Rifle Magnum | Sub-zero extreme cold only |
| Fiocchi Large Rifle | Large Rifle Standard | Consistent European alternative |
| RWS 5341 | Large Rifle | Premium European precision option |
| Ginex Large Rifle | Large Rifle Standard | Cost-effective general option |
| Sellier & Bellot V361617 | Large Rifle Standard | Consistent international option |
The Federal GM210M is the standard competition primer for H4350 in 6.5 Creedmoor precision loading – its tight brisance tolerances complement the Extreme series consistency for single-digit standard deviations. This primer/powder combination is the most referenced in published 6.5 Creedmoor precision data.
Metering and Equipment Compatibility
Hodgdon H4350’s short-cut grain geometry is a practical improvement over the long-stick extruded predecessors it evolved from. On quality volumetric equipment, ±0.1-0.15 grain variance is consistently achievable. This is not ball powder metering performance, but it is adequate for both single-stage precision work and progressive press production of hunting and competition ammunition.
For progressive press 6.5 Creedmoor and 30-06 Springfield production on a Dillon XL 750 or Hornady Lock-N-Load AP, H4350 handles progressive cycling speeds with the consistency that the short-cut geometry enables.
For precision single-stage loading, auto-dispensers including the RCBS ChargeMaster Link, RCBS MatchMaster, and Hornady Auto-Charge Pro handle H4350 efficiently. The short-cut grains trickle through dispenser mechanisms without the bridging that longer sticks can cause.
Reloading Safety Notes
All charge weights must come from current published Hodgdon load data for H4350 specifically. Hodgdon publishes free load data online with regular updates. Do not substitute Accurate 4350, IMR 4350, or IMR 4451 Enduron charge weights without independent verification. Density differences make charge weights non-interchangeable between 4350-class powders.
Start 10% below the listed maximum and work up in 0.3-grain increments. The progressive single-base pressure curve produces gradual pressure sign development – watch for flattened primers, stiff bolt lift, and ejector marks.
See the overpressure in reloading guide for systematic pressure sign identification.
FAQ
Is Hodgdon H4350 truly the best powder for 6.5 Creedmoor?
It is the most thoroughly documented and field-verified starting point for 6.5 Creedmoor with 140-143 grain match bullets – virtually every published load data table, competition reference, and reloading manual starts here. Whether it is “best” depends on priorities: IMR 4451 Enduron adds decoppering with comparable stability. Alliant Reloder 16 adds 40-60 fps velocity with slightly more seasonal variation. Winchester StaBALL 6.5 adds ball powder progressive press metering with partial stability. H4350 is the right choice when the deepest published data library and verified year-round Extreme stability are the primary requirements.
Why does H4350 go out of stock so frequently?
It is the most popular precision rifle powder in North America by volume – the demand from the 6.5 Creedmoor and PRS competition communities, combined with hunting season demand, consistently strains the supply chain. ADI/Thales has finite production capacity, and distribution channels cannot always buffer against demand spikes. Building a seasonal inventory reserve and having a verified alternative are the practical responses.
Are H4350 and IMR 4350 interchangeable?
No – charge weights are not interchangeable. IMR 4350 shows 1.5-2.0 fps/°F temperature sensitivity versus H4350’s 0.14-0.5 fps/°F. The burn rates are in the same class but the powders behave differently in load development and across seasonal temperatures. Develop H4350 loads from its own published data.
Conclusion
Hodgdon H4350 holds its benchmark position through consistent, verified performance that decades of competition use have confirmed. The Extreme series temperature stability is the genuine, documented foundation of that position – not a marketing claim. The deepest published data library in the 4350 class reflects actual investment in documentation across more cartridges and conditions than any competitor has matched. The ADI manufacturing quality and lot-to-lot consistency provide the reliability that competitive precision shooters require.
The limitations are real and worth acknowledging: lower velocity ceiling than double-base alternatives, no decoppering additive, and reliable supply constraints when demand peaks. All are manageable through application selection, inventory planning, and maintaining a tested alternative.
Choose Hodgdon H4350 if you load 6.5 Creedmoor, 270 Winchester, or 30-06 Springfield year-round across seasonal temperature swings and need verified Extreme series stability without load recalculation, and want the deepest published data library in the class. Choose IMR 4451 Enduron if Enduron stability with decoppering chemistry is worth the premium – and as a verified alternative when H4350 supply tightens. Choose Alliant Reloder 16 if maximum velocity in 6.5 Creedmoor and 270 Winchester is the priority and seasonal variation is acceptable. Choose Winchester StaBALL 6.5 if you load at volume on a progressive press and ball powder metering efficiency is the priority over Extreme series stability.
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 H4350, share your results in the comments.
Editorial note: Originally published 2026, revised May 2026. The revision removed the unverifiable “88% of professional precision rifle shooters” marketing statistic, added the complete stability comparison table showing the full -40°F to +120°F range impact at 800 yards, corrected the bulk density to the more accurate ~0.860 g/cc, added the dedicated availability section with the practical inventory planning protocol, clarified the charge weight non-interchangeability with other 4350-class powders, extended the competitor comparisons including the new Accurate 4350 and Winchester StaBALL 6.5 entries, extended the bullet and primer tables with full internal links, and added three community data disclaimer blocks in the correct blockquote format.
