Published: 2026 | Last updated: May 2026
Hodgdon H4198 is a fast-burning, single-base short-cut extruded powder from the Hodgdon Extreme series. It was developed for small-to-medium capacity rifle cases where the burn rate is too fast for Hodgdon Varget or Hodgdon H4895 to produce efficient combustion – the 222 Remington, 221 Fireball, and 22 Hornet class of cases, the 45-70 Government at Trapdoor and lever-action pressure levels, and the 300 Blackout supersonic application.
The Extreme series designation is the defining property of H4198. Its temperature stability – typically 10-20 fps variation across a 60°F temperature swing – is among the best verified figures at the fast-rifle burn rate position. Unlike ball powders in the same burn rate class, H4198’s single-base chemistry combined with the Extreme series deterrent coating produces year-round velocity consistency that varmint hunters shooting from cold mornings through hot afternoons rely on.
The powder’s primary identity is the 222 Remington and 221 Fireball specialist – the small-bore precision cartridges where the Extreme stability makes the most difference and where the burn rate is most precisely calibrated. Its secondary identity is the 45-70 Government standard for Trapdoor and lever-action loads where the fast burn rate in the large case at relatively low pressures is specifically required.
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 H4198 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 H4198 is a single-base, short-cut extruded powder. The single-base formulation – nitrocellulose without nitroglycerin – is the chemical foundation of the Extreme series stability advantage. Single-base powders produce a simpler energy release mechanism than double-base alternatives, and the Extreme series deterrent coating regulates the initial burn phase across temperature changes. The combined result is the 10-20 fps per 60°F stability that field-verified data has confirmed over decades.
The short-cut extruded geometry is the practical improvement over traditional long-stick fast-rifle powders. Where long-grain alternatives like original Alliant Reloder 7 bridge in small-caliber funnels and produce higher metering variance, H4198’s short grains flow through measure apertures with ±0.1 grain variance on quality equipment. The improvement is meaningful for the small-bore benchrest and varmint loading applications where it is most used.
The original article’s description of H4198 as having “very short, fine sticks” is accurate – the grain length is significantly shorter than traditional extruded powders, though not as small as ball powder dimensions. The practical metering result: substantially better than long-stick extruded powders, not at ball powder levels.
Bulk density is approximately 0.850-0.880 g/cc – lower than ball powder alternatives in the same burn rate class like Accurate 1680 at 0.960 g/cc. This lower density means that in the primary small-capacity applications (222 Remington, 221 Fireball), case fill at working charge weights runs 90-98% – near-full case filling that contributes to the consistent ignition and low extreme spread that benchrest accuracy requires.
In 45-70 Government at Trapdoor pressure levels (approximately 14,000-20,000 PSI), the large case volume at a small charge weight is the design condition: the fast burn rate produces adequate pressure from a low charge weight in the large case without the position sensitivity problems that slow powders show when case fill is poor.
Strengths:
- Extreme series temperature stability (10-20 fps per 60°F swing) – among the best at the fast-rifle burn rate position; specifically verified over decades of varmint hunting use
- Short-cut geometry meters at ±0.1 grain – better than long-stick fast-rifle powders; the 222 Remington benchrest community specifically relies on this consistency
- Single-base clean burning – less carbon residue than double-base ball powders in the same burn rate class (Accurate 1680, Hodgdon H110)
- Near-full case fill in primary small-capacity applications – supports consistent ignition and low extreme spread
- 45-70 Government Trapdoor application – specifically calibrated for the low-pressure Trapdoor and lever-action load conditions
- Deep published data library across 222 Remington, 221 Fireball, 22 Hornet, and 45-70 Government
Limitations:
- Fast burn rate limits to small-capacity cases – too fast for efficient combustion in 308 Winchester, 30-06 Springfield, and similar medium-large capacity cases at standard pressures
- 7.62x39mm application is sub-optimal – Accurate 1680 or Accurate LT-30 are better matched burn rates for 7.62x39mm
- Not at ball powder metering levels – ±0.1 grain is good for extruded, but Accurate 1680’s ball geometry achieves ±0.04-0.07 grain at comparable burn rates
- 6.8 SPC application is at the edge – H4198 works in some 6.8 SPC loads but the burn rate is slightly fast; Accurate 2200 and similar slower alternatives are typically better matched
Technical Characteristics
| Property | Specification |
|---|---|
| Manufacturer | Hodgdon Powder Company |
| Series | Hodgdon Extreme |
| Type | Single-Base Short-Cut Extruded |
| Bulk Density (g/cc) | ~0.850 – 0.880 |
| Grain Shape | Short-Cut Stick |
| Coating | Advanced Extreme Series Deterrents |
| Burn Rate Category | Fast Rifle |
| Temperature Stability | ~10-20 fps per 60°F swing |
The IMR 4198 vs. H4198 Distinction
The original article correctly flags that Hodgdon H4198 and IMR 4198 are not identical, but understates the practical importance of this distinction.
Both powders occupy the same fast-rifle burn rate class and many of the same applications. They are not, however, interchangeable by charge weight:
| Powder | Type | Stability | Key Distinction |
|---|---|---|---|
| Hodgdon H4198 | Single-Base Short-Cut | Extreme series | Temperature-stabilized; H4198 burns slightly slower |
| IMR 4198 | Single-Base Short-Cut | Standard | Traditional DuPont formulation; burns slightly faster |
The two powders share the same application class but differ in burn rate position and temperature stability. H4198 carries the Extreme series stabilizer package; IMR 4198 does not. In some cartridges, IMR 4198 produces slightly higher velocity from its faster burn rate. In all applications, H4198 produces better seasonal velocity consistency.
Never apply IMR 4198 charge weights to H4198 or vice versa. Develop each from its own published data.
Temperature Stability – The Extreme Series Advantage at Fast Burn Rates
10-20 fps per 60°F temperature swing is the documented Extreme series performance for H4198 – among the best stability figures at any burn rate position. The significance of this stability is amplified at the fast-rifle burn rate position where the primary applications are:
Varmint hunting across a single day: A prairie dog shooter typically encounters 20-40°F of temperature variation from morning to afternoon on a productive day. With H4198, this variation produces 3-7 fps velocity shift – essentially unmeasurable at any practical varmint distance.
Year-round 222 Remington benchrest shooting: From winter indoor practice to summer outdoor matches, the load developed in one season produces the same velocities in another. No seasonal load recalculation required.
45-70 Government hunting: A Trapdoor or lever-action hunter who develops loads in spring has confidence that the same loads will perform identically in an October hunt.
| Powder | 60°F Swing | Practical Impact |
|---|---|---|
| Hodgdon H4198 | 10-20 fps | Negligible at varmint and hunting distances |
| Hodgdon H322 | ~20-30 fps | Minimal – also Extreme series |
| Alliant Reloder 7 | ~40-60 fps | Noticeable at 400+ yards |
| Accurate 1680 | ~60-90 fps | Requires temperature protocol for precision |
| IMR 4198 | ~50-70 fps | Moderate – seasonal chart update advised |
Burn Rate Comparison and Competing Powders
| Powder | Type | Density (g/cc) | Key Character |
|---|---|---|---|
| Hodgdon H322 | Single-Base Extruded | 0.895 | Slightly Faster – Extreme, 6mm PPC |
| IMR 4198 | Single-Base Short-Cut | 0.850 | Slightly Faster – no Extreme additive |
| Alliant Reloder 7 | Single-Base Extruded | 0.880 | Similar – 45-70, broad fast coverage |
| Hodgdon H4198 | Single-Base Short-Cut | 0.865 | Reference – Extreme stability |
| Vihtavuori N120 | Single-Base Extruded | 0.860 | Similar – European single-base |
| Accurate 1680 | Double-Base Ball | 0.960 | Slightly Slower – 7.62×39, 300 BLK |
| Hodgdon Benchmark | Single-Base Extruded | 0.920 | Slightly Slower – Extreme, 204 Ruger |
| Accurate LT-30 | Single-Base Fine Extruded | 0.895 | Similar – 30 BR benchrest |
vs. IMR 4198: Covered in the dedicated section above. IMR 4198 burns slightly faster and lacks the Extreme series additive. Both powders work in the same applications; H4198 provides better seasonal consistency. Charge weights are not interchangeable.
vs. Alliant Reloder 7: Reloder 7 is a single-base extruded powder at a comparable burn rate with approximately 40-60 fps per 60°F variation – substantially more sensitive than H4198. It has deep data in 45-70 Government and is a natural competitor for that application. H4198 wins on temperature stability in any shared application; Reloder 7 has a broader application range including some larger cases. For varmint shooting where Extreme stability matters, H4198 is the clear choice.
vs. Accurate 1680: Accurate 1680 is a double-base ball powder at a slightly slower burn rate – specifically calibrated for 7.62x39mm and 300 Blackout subsonic. It meters better from ball geometry but shows 60-90 fps per 60°F sensitivity – 4-6 times more sensitive than H4198. For 300 Blackout supersonic and 7.62x39mm bolt-gun precision where Extreme stability is the priority, H4198 is the more appropriate single-base choice. For high-volume progressive press 300 Blackout and 7.62x39mm production, Accurate 1680’s ball metering is the practical advantage.
vs. Vihtavuori N120: N120 is a European single-base extruded powder at a comparable burn rate. It burns exceptionally cleanly – less residue per round than H4198 – and Vihtavuori’s vertically integrated manufacturing produces excellent lot-to-lot consistency. Its temperature stability is comparable to but typically not quite at Extreme series levels. For European market access or shooters who value Vihtavuori’s clean burning above Extreme series stability, N120 is a legitimate alternative. In the North American market, H4198 is more widely documented and typically more available.
vs. Hodgdon Benchmark: Benchmark burns slightly slower and is the Extreme series choice for 204 Ruger and 223 Remington with 40-55 grain varmint bullets. H4198 is better matched for the smaller 222 Remington and 221 Fireball cases where Benchmark’s slightly slower burn is less efficient. Both belong to the Extreme series.
Recommended Cartridges and Applications
Hodgdon H4198 operates most efficiently in small-capacity cases and large-bore cases at low pressure levels.
| Cartridge | Bullet Weight Range | Notes |
|---|---|---|
| 222 Remington | 40-55 gr | Primary benchrest and varmint application |
| 221 Fireball | 40-52 gr | Maximum velocity small-bore specialist |
| 22 Hornet | 35-52 gr | Classic small-bore varmint |
| 223 Remington | 40-52 gr | Light bullets only – see note |
| 45-70 Government | 300-405 gr | Trapdoor and lever-action loads only |
| 300 Blackout | 110-125 gr | Supersonic carbine applications |
| 6.5 Grendel | 90-100 gr | Light bullets only |
| 7.62x39mm | 123-125 gr | Bolt-action precision – see note |
222 Remington is the home territory for H4198 – the application where the burn rate is most precisely matched to case volume, case fill is near-ideal, and the Extreme series stability is most practically visible in maintaining consistent POI across varmint hunting seasons. The 222 Remington benchrest community has validated H4198 over decades as one of the most consistent-performing powders in that cartridge.
45-70 Government at Trapdoor and lever-action pressure levels is the second critical application. At Trapdoor pressures (approximately 14,000-20,000 PSI) and lever-action pressures (approximately 28,000-40,000 PSI), H4198 generates adequate velocity from the large case. The 45-70 Government three-pressure-level safety framework is critical here: H4198 data is specifically published for Trapdoor and lever-action pressure levels. Do not use 45-70 Government data developed for modern single-shot rifles (50,000-60,000 PSI) in Trapdoor or standard lever-action firearms.
223 Remington with 40-52 grain light bullets only: With standard 55-69 grain bullets, Hodgdon H335 or Hodgdon Varget are better burn rate matches. H4198 is specifically appropriate for the lightest 223 Remington varmint loads where the small charge weight reduces effective case volume.
7.62x39mm note: Accurate 1680 is the more specifically documented powder for 7.62x39mm in both semi-automatic and bolt-action platforms. H4198 works in 7.62x39mm bolt-gun precision applications where Extreme stability is valued, but the burn rate is at the fast edge of what 7.62x39mm uses efficiently. Verify from Hodgdon published data.
The 45-70 Government Safety Framework
The 45-70 Government has three distinct pressure tiers, and H4198 load data must be matched to the correct tier for the firearm in use. This is not a general caution – it is a critical safety distinction:
Tier 1 – Trapdoor Springfield (~14,000-20,000 PSI): Original Civil War and post-war action with limited strength. H4198 published data for Trapdoor loads is specifically appropriate here. Maximum charge weights for Trapdoor loads produce modest velocities with 300-405 grain bullets.
Tier 2 – Lever-Action Rifles (~28,000-40,000 PSI): Winchester Model 1886, Marlin 1895, and similar lever-actions with higher operating pressure limits than Trapdoor. Some powders have separate data for lever-action pressure levels.
Tier 3 – Modern Strong Single-Shot Rifles (~50,000-60,000 PSI): Modern falling block actions (Ruger No. 1, Browning 1885) that can handle full-power loads. H4198 is not specifically documented for these maximum-pressure 45-70 Government loads; the burn rate is appropriate for the lower-pressure tiers only.
Always identify which pressure tier your rifle falls into and use only published data developed for that tier.
Bullets
Hodgdon H4198 is suited to light-to-standard weight varmint and small-bore precision bullets in its primary bore sizes, and to heavy cast or jacketed hunting bullets in 45-70 Government at appropriate pressure tiers.
| Brand | Model | Weight | Cartridge | Application |
|---|---|---|---|---|
| Hornady | V-MAX | 40-55 gr | 222 Rem / 223 Rem (light) | Varmint Hunting |
| Sierra | BlitzKing | 40-55 gr | 222 Rem / 22 Hornet | Precision Varmint |
| Nosler | Ballistic Tip | 40-55 gr | 222 Rem / 22 Hornet | Long-Range Varmint |
| Berger | Varmint Explosive | 40-52 gr | 222 Rem | Match Varmint |
| Sierra | MatchKing | 52-55 gr | 222 Rem | Benchrest Competition |
| Hornady | NTX | 32-35 gr | 22 Hornet | Lead-Free Varmint |
| Barnes | TTSX | 45-55 gr | 223 Rem (light) | Lead-Free Hunting |
| Hornady | InterLock FP | 300-405 gr | 45-70 Gov’t | Lever-Action Hunting |
| Hornady | LeverEvolution | 325 gr | 45-70 Gov’t | Modern Lever-Action |
| Sierra | MatchKing | 110-125 gr | 300 Blackout | Supersonic Precision |
Have you loaded Hodgdon H4198? Your practical data on charge weights, accuracy in 222 Remington, 45-70 Trapdoor applications, or temperature stability across seasons helps other reloaders more than any spec sheet. Leave a comment below.
Primers
Hodgdon H4198 as a single-base short-cut powder responds well to quality small rifle primers in small-bore applications and standard large rifle primers for 45-70 Government and 7.62x39mm. The original article’s recommendation for the CCI 450 small rifle magnum for 6.8 SPC is appropriate for that higher-pressure carbine application. For the primary small-bore benchrest applications, benchrest-grade standard primers provide the most consistent ignition with minimum extreme spread.
| Primer | Type | Application |
|---|---|---|
| CCI BR-4 | Small Rifle Benchrest | 222 Rem benchrest – lowest SD |
| Federal GM205M | Small Rifle Match | Competition precision |
| Remington 7-1/2 | Small Rifle Bench Rest | 222 Rem classic benchrest pairing |
| Federal 205 | Small Rifle Standard | Consistent small case ignition |
| Winchester WSR | Small Rifle Standard | 222 Rem, 223 Rem (light) general |
| CCI 400 | Small Rifle Standard | General small case development |
| CCI 450 | Small Rifle Magnum | 6.8 SPC, cold weather below 15°F |
| CCI No. 41 | Small Rifle Magnum (Mil-Spec) | AR-platform 300 BLK semi-auto |
| CCI 200 | Large Rifle Standard | 45-70 Government all pressure tiers |
| Winchester WLR | Large Rifle Standard | 7.62x39mm, 45-70 Government |
| RWS 4033 | Small Rifle | Premium European small rifle |
| Ginex Small Rifle | Small Rifle Standard | Cost-effective general use |
| Fiocchi Small Rifle | Small Rifle Standard | Volume production alternative |
| Sellier & Bellot V361617 | Large Rifle Standard | 45-70 Government consistent option |
For 300 Blackout in AR-15 semi-automatic platforms, the CCI No. 41 mil-spec cup primer prevents slam-fire from a free-floating firing pin. Standard primers in dense powder charges in semi-automatic platforms carry slam-fire risk.
Metering and Equipment Compatibility
Hodgdon H4198’s short-cut geometry produces meaningfully better metering than traditional long-stick fast-rifle powders. On quality equipment, ±0.1 grain charge-to-charge variance is consistently achievable.
For 222 Remington and 221 Fireball precision bench loading:
- Throw slightly under target weight with the Redding Competition 10X or Redding Competition BR-30
- Trickle to exact weight with a Frankford Arsenal Powder Trickler on the RCBS MatchMaster or Lyman Gen 6 Compact
At 222 Remington charge weights (typically 18-23 grains), individual H4198 kernels weigh approximately 0.04-0.07 grains, providing good single-kernel resolution for manual trickling to ±0.02 grains.
For 45-70 Government and 300 Blackout production, the Frankford Arsenal Intellidropper 2.0 and RCBS ChargeMaster Supreme handle H4198 efficiently at moderate charge weights.
Reloading Safety Notes
All charge weights must come from current published Hodgdon load data for H4198 specifically. Do not substitute IMR 4198 or Alliant Reloder 7 charge weights without independent verification.
[45-70 Government] pressure tier matching is mandatory. Always confirm which pressure level your published data was developed for and whether that level is appropriate for your rifle. Trapdoor Springfield data cannot be used in modern single-shot rifles and vice versa.
Start 10% below the listed maximum and work up in 0.2-grain increments for small cases (222 Remington, 221 Fireball) and 0.5-grain increments for 45-70 Government. Pressure signs vary by application – watch for flattened primers, hard extraction, and in lever-action [45-70 Government], stiff lever operation.
See the overpressure in reloading guide for systematic pressure sign identification.
FAQ
Is H4198 good for 6.8 SPC precision loading?
H4198 is documented for 6.8 SPC and produces functional loads. However, the burn rate is at the fast end for 6.8 SPC efficiency – Accurate 2200 and Hodgdon CFE BLK are typically better burn rate matches. The Extreme stability of H4198 is the specific reason to choose it for 6.8 SPC if year-round temperature consistency is the priority.
Can H4198 be used for 300 Blackout subsonic loads?
No – H4198 is too fast for 300 Blackout subsonic applications with 200-220 grain bullets. The very small charge weights required for subsonic velocities with a fast powder produce inadequate pressure for consistent ignition. Use Accurate 1680 or Hodgdon CFE BLK for subsonic 300 Blackout. H4198 in 300 Blackout is specifically for supersonic 110-125 grain loads.
Conclusion
Hodgdon H4198 is one of the few fast-rifle powders that combines Extreme series temperature stability with the documented accuracy that 222 Remington benchrest competition has validated over decades. The short-cut geometry provides adequate metering consistency for both precision bench work and high-volume field production. The 45-70 Government coverage at Trapdoor and lever-action pressure levels adds genuine versatility at the fast end of the rifle burn rate spectrum.
Choose Hodgdon H4198 if you load 222 Remington or 221 Fireball for precision varmint hunting or benchrest with year-round temperature consistency as a priority, or if you load 45-70 Government for Trapdoor or standard lever-action rifles where the fast burn rate in the large case at low pressure is required. Choose Hodgdon Benchmark if 204 Ruger and light-bullet 223 Remington at Extreme stability are the primary applications. Choose Accurate 1680 if 7.62x39mm or 300 Blackout subsonic are the priority and ball powder metering is needed. Choose IMR 4198 if slightly higher velocity at the cost of Extreme stability is the specific application requirement – and develop from its own published data.
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 H4198, share your results in the comments.
Editorial note: Originally published 2026, revised May 2026. The revision expanded the IMR 4198 vs H4198 section from a brief caution into a dedicated comparison table, added the 45-70 Government three-pressure-tier safety framework, corrected the 6.8 SPC application from “primary” to “edge of burn rate – verify data,” added the 300 Blackout subsonic warning (H4198 is too fast for subsonic, appropriate only for supersonic), added the 7.62x39mm note pointing to Accurate 1680 as better matched, added the temperature stability comparison table with field-application context, extended the competitor comparisons to include Vihtavuori N120, Accurate LT-30, and Hodgdon Benchmark, extended the bullet and primer tables with full internal links, and added three community data disclaimer blocks in the correct blockquote format.
