Published: 2026 | Last updated: May 2026
Vihtavuori N120 is a fast-burning, single-base micro-stick extruded powder from Vihtavuori (Nammo Group, Finland), originally developed as the Finnish military propellant N 21. It is the fastest powder in the Vihtavuori N100 rifle series and carries two specific technical properties that define its competitive identity: micro-grain geometry that produces near-ball-powder metering performance from an extruded powder, and an integrated decoppering additive that chemically reduces copper jacket adhesion to the bore surface.
The powder occupies a specific application niche: small-capacity benchrest precision cases (222 Remington, 221 Fireball), 7.62x39mm bolt-action precision, and 300 Blackout supersonic loads. The original article’s listing of 300 Blackout subsonic as a primary application requires a direct correction: N120 is too fast for 300 Blackout subsonic loads with 200-220 grain bullets. The required charge weights for subsonic velocities with a fast powder produce inadequate pressure for consistent ignition – squib risk is real. Use Accurate 1680 or Hodgdon CFE BLK for subsonic 300 Blackout.
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 Vihtavuori N120 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
Vihtavuori N120 is a single-base, micro-stick extruded powder. The single-base formulation – nitrocellulose without nitroglycerin – is the chemical basis for its clean-burning behavior and the temperature stability that is characteristic of single-base extruded chemistry.
The micro-grain geometry is the engineering achievement: grains measuring approximately 0.8 mm in length and 0.6 mm in diameter – the smallest grain in the entire Vihtavuori rifle powder lineup. At this grain size, the bridging and shearing that plague longer extruded stick powders are substantially reduced. The practical result: charge-to-charge variance of approximately ±0.07-0.12 grains on quality volumetric equipment – near-ball-powder metering performance from a single-base extruded product.
The integrated decoppering additive is embedded in the grain structure. During combustion, its byproducts react with copper deposited by the bullet jacket, preventing full bonding to the bore surface. The practical benefit: measurably reduced copper accumulation per round count compared to non-decoppering alternatives. This is the same principle as Hodgdon’s CFE chemistry, applied from a Finnish single-base extruded formulation.
Bulk density is 0.840 g/cc – lower than ball powder alternatives at this burn rate (Accurate 1680 at 0.960 g/cc) and consistent with single-base extruded powders at the fast-rifle position. The lower density compared to ball alternatives means slightly lower case fill per grain of charge – a practical consideration in the smallest cases like 221 Fireball where case fill margins are narrow.
Temperature stability is approximately 0.5-0.7 fps/°F – consistent with Vihtavuori’s single-base extruded chemistry and significantly better than double-base ball alternatives in the same burn rate class (Accurate 1680 at ~1.0-1.5 fps/°F). While not at Hodgdon H4198’s Extreme series level (~0.3 fps/°F), it is meaningfully better than the double-base alternatives it competes with.
Strengths:
- Micro-grain metering (±0.07-0.12 grains) – the best metering performance of any extruded powder at this burn rate; rivals ball powders for volumetric production loading
- Integrated decoppering additive – chemically reduces copper accumulation rate; extends cleaning intervals in high-volume 222 Remington and small-bore sessions
- Single-base clean burning – less carbon residue than double-base alternatives at equivalent pressures; specifically relevant for long benchrest sessions
- Good temperature stability (0.5-0.7 fps/°F) – approximately 2x better seasonal consistency than Accurate 1680 at the same burn rate class
- Vihtavuori lot-to-lot consistency – single-facility Finnish manufacturing with tightly controlled lot-to-lot variation; specifically valued in competition where changing powder lots mid-season is disruptive
- 222 Remington benchrest track record – documented precision in the oldest and most technically demanding small-bore benchrest application
Limitations:
- 300 Blackout subsonic loads are not appropriate – burn rate too fast; inadequate pressure from the small charge weights required → squib risk
- Lower bulk density (0.840 g/cc) than ball alternatives → lower case fill per charge weight in the smallest cases
- Not at H4198 Extreme series stability – 0.5-0.7 fps/°F is good but H4198 at ~0.3 fps/°F is approximately 2x more seasonally stable
- 45-70 Government application requires pressure tier awareness – three-tier safety framework applies
Technical Characteristics
| Property | Specification |
|---|---|
| Manufacturer | Vihtavuori (Nammo Group, Finland) |
| Military Heritage | Finnish Army N 21 |
| Type | Single-Base Micro-Stick Extruded |
| Bulk Density (g/cc) | 0.840 |
| Grain Size | ~0.8 mm L x 0.6 mm D |
| Coating | Graphite + Decoppering Additive |
| Burn Rate Category | Fast Rifle |
| Temperature Stability | ~0.5-0.7 fps / °F |
The 300 Blackout Subsonic Correction
The original article lists 300 Blackout subsonic as a primary application for N120 and includes a Pro Tip about improving subsonic standard deviations. This requires direct correction.
N120 is too fast for 300 Blackout subsonic loads. The subsonic application requires a charge weight small enough to keep 200-220 grain bullets below approximately 1,050 fps. With a fast powder, the charge weight required to stay subsonic is so small that the resulting chamber pressure is below the minimum threshold for consistent ignition. The result is hangfires, squibs, and erratic velocities – exactly the failure modes documented in the H110 and Lil’Gun subsonic prohibition notes elsewhere on this site.
For 300 Blackout subsonic with 200-220 grain bullets: use Accurate 1680 or Hodgdon CFE BLK – both are specifically documented for this application and calibrated for the pressure requirements with heavy subsonic bullets.
N120 in 300 Blackout supersonic (110-125 grain bullets) is a legitimate and documented application where the faster burn rate is appropriate for the shorter charge weights at supersonic pressure levels.
Temperature Stability – The Vihtavuori Single-Base Advantage
0.5-0.7 fps per degree Fahrenheit positions N120 meaningfully better than double-base ball alternatives in the fast-rifle class:
| Powder | Type | 60°F Swing | At 300 yards | At 400 yards |
|---|---|---|---|---|
| Hodgdon H4198 | SB Short-Cut (Extreme) | ~18 fps | <0.4″ | <0.7″ |
| Vihtavuori N120 | SB Micro-Stick | ~30-42 fps | ~0.6-0.9″ | ~1-1.5″ |
| IMR 4198 | SB Short-Cut | ~30-48 fps | ~0.7-1.0″ | ~1.3-1.8″ |
| Alliant Reloder 7 | SB Extruded | ~36-54 fps | ~0.8-1.2″ | ~1.5-2″ |
| Accurate 1680 | DB Ball | ~60-90 fps | ~1.5-2″ | ~2.5-3″ |
For benchrest competition where temperature consistency is specifically valued, N120 is approximately 2x better than Accurate 1680 and somewhat better than IMR 4198. H4198 remains the Extreme series benchmark.
Burn Rate Comparison and Competing Powders
| Powder | Type | Density (g/cc) | Burn Position | Key Character |
|---|---|---|---|---|
| Hodgdon H4198 | SB Short-Cut | 0.865 | Slightly Slower | Extreme series |
| IMR 4198 | SB Short-Cut | 0.865 | Slightly Slower | Traditional |
| Vihtavuori N120 | SB Micro-Stick | 0.840 | Reference | Decoppering, micro-grain |
| Alliant Reloder 7 | SB Extruded | 0.880 | Slightly Slower | Straight-wall specialist |
| Accurate 2015 | SB Short-Cut | 0.895 | Slightly Slower | Versatile |
| Accurate 1680 | DB Ball | 0.960 | Slightly Slower | 7.62×39, 300 BLK subsonic |
| Vihtavuori N130 | SB Extruded | 0.855 | Much Slower | 223 Rem standard |
The original article’s H4198 density (0.835 g/cc) is corrected to ~0.865 g/cc.
vs. Hodgdon H4198: H4198 burns slightly slower and carries Extreme series temperature stability (~0.3 fps/°F vs N120’s ~0.5-0.7 fps/°F). N120 provides the decoppering additive that H4198 lacks and often produces comparable or slightly higher velocities from its faster burn. For year-round benchrest competition where the Extreme series stability advantage matters, H4198 is more stable. For shooters who value the decoppering benefit and Vihtavuori’s lot-to-lot consistency, N120 is a competitive choice. Neither is universally superior – load development in the specific rifle guides the selection.
vs. IMR 4198: IMR 4198 burns at a comparable rate but with traditional short-cut geometry that meters less consistently than N120’s micro-grain. N120 provides better metering, decoppering chemistry, and marginally better temperature stability than IMR 4198. The trade-off is the deep North American data library of IMR 4198 in applications like 45-70 Government.
vs. Accurate 1680: Accurate 1680 is a double-base ball powder at a slightly slower burn rate – specifically calibrated for 7.62x39mm semi-automatic carbine cycling and 300 Blackout subsonic. N120 provides better temperature stability, single-base cleanliness, and decoppering. 1680 meters better from ball geometry and is more specifically documented for gas-operated 7.62x39mm semi-auto cycling. For 7.62x39mm bolt-action precision where stability and cleanliness matter more than gas port timing, N120 is appropriate.
vs. Alliant Reloder 7: Alliant Reloder 7 burns slightly slower with comparable single-base chemistry and is the classic straight-wall cartridge (45-70 Government, 444 Marlin) specialist. N120 produces better metering from micro-grain geometry and adds decoppering. For bottle-neck small-bore benchrest and varmint applications, N120 is the more precisely matched choice. For straight-wall hunting cartridges, Reloder 7 has the deeper published data.
Recommended Cartridges and Applications
Vihtavuori N120 is most effective in small-capacity bottle-neck rifle cases and large-bore straight-wall cases at low-to-moderate pressures.
| Cartridge | Bullet Weight Range | Notes |
|---|---|---|
| 222 Remington | 40-55 gr | Primary benchrest and varmint |
| 221 Fireball | 40-52 gr | Maximum velocity small-bore |
| 7.62x39mm | 123-125 gr | Bolt-action precision – see note |
| 300 Blackout | 110-125 gr | Supersonic only – see note |
| 30-30 Winchester | 110-150 gr | Light bullets |
| 45-70 Government | 300-405 gr | Trapdoor / lever-action only |
| 6mm ARC | 90-108 gr | Verify from Vihtavuori data |
| 303 British | 150-180 gr | Standard bolt-action hunting |
300 Blackout supersonic only – not subsonic. See the dedicated correction section above. For supersonic 110-125 grain loads in 300 Blackout bolt-action or AR-15, N120 is a legitimate choice where Vihtavuori lot consistency and decoppering are specifically valued.
7.62x39mm bolt-action note: Accurate 1680 is more specifically documented for semi-automatic AK/SKS gas system cycling in 7.62x39mm. N120 is appropriate for 7.62x39mm bolt-action precision applications where gas port timing is not a constraint.
45-70 Government pressure tier note: Trapdoor (~14,000-20,000 PSI), lever-action (~28,000-40,000 PSI), and modern single-shot (~50,000-60,000 PSI) tiers require data developed specifically for each tier. Use only Vihtavuori published data for the specific pressure tier matching your rifle.
Bullets
Vihtavuori N120 is paired best with light varmint and precision benchrest bullets in small-bore calibers.
| Brand | Model | Weight | Cartridge | Application |
|---|---|---|---|---|
| Sierra | MatchKing | 52-53 gr | 222 Rem | Benchrest Competition |
| Hornady | V-MAX | 40-55 gr | 222 Rem / 221 Fireball | Varmint Hunting |
| Sierra | BlitzKing | 40-55 gr | 222 Rem | Precision Varmint |
| Berger | Varmint Explosive | 40-52 gr | 222 Rem | Match Varmint |
| Lapua | Scenar | 123 gr | 7.62x39mm | Bolt-Action Precision |
| Nosler | Ballistic Tip | 110-125 gr | 300 BLK (supersonic) | Supersonic Hunting |
| Sierra | MatchKing | 110-125 gr | 300 BLK (supersonic) | Supersonic Precision |
| Sierra | GameKing | 150-165 gr | 30-30 Win | Lever-Action Hunting |
| Hornady | InterLock FP | 300-405 gr | 45-70 Gov’t | Lever-Action Hunting |
| Nosler | Varmageddon | 40-55 gr | 222 Rem | Varmint Control |
Have you loaded Vihtavuori N120? Your practical data on charge weights, benchrest accuracy in 222 Remington, copper fouling reduction results, temperature behavior, or comparison with H4198 helps other reloaders more than any spec sheet. Leave a comment below.
Primers
Vihtavuori N120 as a single-base micro-stick powder ignites consistently from standard small rifle primers in benchrest and varmint applications. The pressure requirement for complete combustion is met at working charge weights in small-capacity cases without magnum primer assistance.
For AR-15 semi-automatic 300 Blackout supersonic platforms, CCI No. 41 mil-spec cup primer is required to prevent slam-fire from the free-floating firing pin.
| 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 | Classic benchrest pairing |
| CCI 400 | Small Rifle Standard | General development |
| Winchester WSR | Small Rifle Standard | General small rifle use |
| CCI 450 | Small Rifle Magnum | Cold weather below 10°F |
| CCI No. 41 | Small Rifle Magnum (Mil-Spec) | AR-15 semi-auto 300 BLK |
| Federal 205 | Small Rifle Standard | Precision varmint loads |
| RWS 4033 | Small Rifle | Premium European precision – pairing Finnish powder with Finnish or European primers is specifically recommended by competitive benchrest shooters |
| Fiocchi Small Rifle | Small Rifle Standard | Volume production |
| Ginex Small Rifle | Small Rifle Standard | Cost-effective general use |
| Sellier & Bellot V361607 | Small Rifle Standard | Consistent international option |
Metering and Equipment Compatibility
Vihtavuori N120’s micro-grain geometry (0.8 mm x 0.6 mm) produces metering performance that is the primary practical advantage of the powder over standard extruded alternatives. On quality measures including the Redding Competition BR-30 and Redding Competition 10X, ±0.07-0.12 grain variance is achievable at normal cycling speeds.
For benchrest single-stage loading: throw slightly under target weight with the measure, then trickle to exact weight with a Frankford Arsenal Powder Trickler on a RCBS MatchMaster for ±0.02 grain charge consistency.
For 300 Blackout and 7.62x39mm production loading, auto-dispensers including the Frankford Arsenal Intellidropper 2.0 handle the micro-grain efficiently at moderate charge weights.
Reloading Safety Notes
All charge weights must come from current published Vihtavuori load data for N120 specifically. Vihtavuori publishes free online load data. Do not substitute Hodgdon H4198, IMR 4198, or Accurate 1680 charge weights without independent verification.
300 Blackout subsonic prohibition: Do not use N120 for subsonic 200-220 grain loads. The charge weight required for subsonic velocity is too small for adequate ignition pressure. Use Accurate 1680 or Hodgdon CFE BLK.
[45-70 Government] pressure tier matching is mandatory. The three tiers require separate published data.
Start 10% below the listed maximum and work up in 0.2-grain increments for small cases (222 Remington, 221 Fireball). Watch for flattened primers, stiff bolt lift, ejector marks.
See the overpressure in reloading guide for systematic pressure sign identification.
FAQ
Is N120 better than H4198 for 222 Remington benchrest?
Both are used competitively at the highest levels of 222 Remington benchrest. H4198 carries Extreme series stability (~0.3 fps/°F vs N120’s ~0.5-0.7 fps/°F) – approximately 2x better seasonal consistency. N120 provides the decoppering additive and Vihtavuori’s documented lot-to-lot consistency. For competitions spanning extreme seasonal temperatures, H4198 is more stable. For shooters who value decoppering and European manufacturing consistency, N120 is competitive. Load development in the specific rifle determines the practical winner.
Can N120 be used for 300 Blackout subsonic?
No. N120 is too fast for 300 Blackout subsonic with 200-220 grain bullets. The small charge weights required for subsonic velocities produce inadequate chamber pressure for consistent ignition – squib risk is real. Use Accurate 1680 or Hodgdon CFE BLK for subsonic 300 Blackout.
What makes Vihtavuori’s lot-to-lot consistency specifically valuable for competition?
Changing powder lots mid-season typically requires partial load redevelopment because burn rates shift slightly between manufacturing batches. Vihtavuori’s single-facility Finnish manufacturing, combined with their lot-to-lot certification testing, produces batch-to-batch consistency that reduces this redevelopment overhead for competitive shooters who buy multiple canisters per season.
Conclusion
Vihtavuori N120 earns its place in the fast-rifle powder spectrum through a specific combination that no competitor fully replicates: micro-grain metering performance from a single-base extruded product, integrated decoppering chemistry, moderate temperature stability significantly better than double-base ball alternatives, and Vihtavuori’s documented lot-to-lot consistency.
Choose Vihtavuori N120 if you load 222 Remington or 221 Fireball for benchrest or precision varmint where decoppering and European manufacturing consistency are specifically valued, or if you load 300 Blackout supersonic or 7.62x39mm bolt-action precision where single-base cleanliness and decoppering are priorities. Choose Hodgdon H4198 if Extreme series temperature stability is the priority in these applications. Choose Accurate 1680 if 300 Blackout subsonic or 7.62x39mm semi-automatic carbine cycling are the primary applications. Choose Alliant Reloder 7 if straight-wall hunting cartridge applications (45-70 Government) with deep published data history 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 Vihtavuori N120, share your results in the comments.
Editorial note: Originally published 2026, revised May 2026. The revision added a direct correction of the 300 Blackout subsonic application – N120 is too fast for subsonic loads and the original’s “Pro Tip” about improving subsonic SD was incorrect; Accurate 1680 or CFE BLK are the appropriate subsonic choices. Corrected the H4198 density in the comparison table from 0.835 to ~0.865 g/cc. Added the 45-70 Government three-pressure-tier safety note. Added the 7.62x39mm semi-automatic caution pointing to Accurate 1680 for AK/SKS gas system applications. Added the temperature stability comparison table with specific inches-at-distance figures. Extended competitor comparisons to include Accurate 2015 and Vihtavuori N130. Extended the bullet and primer tables with full internal links. Added three community data disclaimer blocks in the correct blockquote format.
