Vihtavuori N560 is a pinnacle of Finnish propellant engineering, specifically designed to bridge the gap between traditional single-base slow-burners and the high-energy requirements of modern magnum cartridges. As a member of the elite N500 series, Vihtavuori N560 represents a specialized class of double-base powders that have been “impregnated” with nitroglycerin to provide a significantly higher specific energy than standard nitrocellulose propellants. In the competitive landscape of long-range shooting and extreme big-game hunting, Vihtavuori N560 has earned a reputation as the “velocity king” for large-capacity cases.
The development of Vihtavuori N560 was driven by the evolution of long-range ballistics, where shooters began demanding higher muzzle velocities from heavy-for-caliber projectiles without the erratic pressure spikes often seen in less refined magnums. By carefully balancing the physical geometry of its kernels with a precise chemical infusion of energy-rich compounds, Vihtavuori has produced a powder that pushes the boundaries of internal ballistics. This article provides a comprehensive technical analysis of Vihtavuori N560, exploring its chemical composition, performance metrics, and optimized component pairings for elite-level performance.
Executive Summary
- Main Application: Large-capacity rifle cases and magnums using heavy bullets (e.g., 270 Winchester, 6.5-284 Norma, 7mm Remington Magnum).
- Key Advantage: High energy density allows for maximized muzzle velocity in “overbore” cartridges.
- Burn Rate: Slow-burning, situated between Vihtavuori N160 and Vihtavuori N165 in the burn chart hierarchy.
- What This Guide Covers: Chemical energy analysis, temperature stability benchmarks, a 4-way competitive comparison, and optimized component selection for high-performance calibers.
Best For: Serious long-range hunters and precision rifle competitors seeking to maximize the ballistic coefficient of heavy projectiles in 6.5mm, 7mm, and 30-caliber magnums.
Powder Description & Technical Profile
Vihtavuori N560 is a premium extruded powder that features a specialized cylindrical grain geometry. Unlike the N100 series, which consists of single-base powders, Vihtavuori N560 is a high-energy double-base powder. The manufacturing process involves infusing the nitrocellulose kernels with nitroglycerin. This is not a simple surface coating; the nitroglycerin is integrated into the molecular structure of the propellant, which increases the specific energy per gram. This allows Vihtavuori N560 to generate higher velocities than its single-base siblings at identical peak chamber pressures.
The grain dimensions of Vihtavuori N560 are meticulously controlled, with kernels measuring 1.3 mm in length and 1.1 mm in diameter. This specific shape is designed to provide a progressive burn rate. A progressive burn means the powder surface area increases as the grains consume themselves, maintaining a sustained pressure curve against the base of the bullet as it travels down the bore. This is particularly effective in long barrels (26-30 inches), where the powder can continue to provide acceleration after the initial ignition spike.
Expert reloaders often describe the “feel” of Vihtavuori N560 as providing a firm, linear push. While some fast-burning magnums can produce a violent recoil snap, Vihtavuori N560 spreads the energy release over a longer duration. However, because it is a high-energy powder, it does generate higher flame temperatures than the N100 series. To mitigate this, Vihtavuori incorporates advanced deterrents and barrel-protection additives to minimize throat erosion, though shooters should still manage their firing rates during high-volume sessions to preserve barrel accuracy.
Pros & Cons
- Pro: Delivers industry-leading velocities for heavy bullets in large-capacity cases.
- Pro: High load density ensures consistent ignition and low Standard Deviation (SD) numbers.
- Pro: Excellent lot-to-lot consistency reduces the need for frequent load re-development.
- Pro: Integrated decoppering agents help prevent copper fouling in the bore.
- Con: Higher flame temperature can lead to faster throat erosion in “overbore” calibers.
- Con: Moderate sensitivity to extreme temperature shifts compared to ultra-stable single-base powders.
- Con: Large extruded kernels require attention to metering in volumetric measures.
Technical Characteristics
The engineering data for Vihtavuori N560 highlights its role as a specialized magnum propellant. It is one of the densest powders in the Vihtavuori lineup, allowing for maximum case fill without excessive compression.
| Property | Specification |
| Bulk Density (g/l) | 960 |
| Energy Content (J/g) | 4000 |
| Burn Rate Category | Slow-Burning Magnum |
| Grain Shape | Cylindrical Extruded Stick |
| Grain Dimensions | 1.3 mm x 1.1 mm |
| Base | Double-Base (Nitroglycerin Infused) |
Temperature Stability & Burn Rate Analysis
A critical factor in long-range ballistics is the powder’s reaction to environmental changes. Vihtavuori N560, being a double-base powder, is inherently more sensitive to thermal shifts than “Extreme” line propellants like Hodgdon H1000. However, it remains significantly more stable than older generation double-base magnums. Field testing and reloader consensus indicate a velocity variance of approximately 1.5-1.9 FPS per degree Fahrenheit.
This moderate sensitivity means that a load developed at 60 degrees Fahrenheit may show signs of overpressure when fired in 95-degree summer heat. Conversely, in sub-zero hunting conditions, a slight drop in velocity and a shift in vertical point-of-impact are possible. Precision shooters using Vihtavuori N560 often create “seasonal” ballistic profiles to account for these shifts or maintain their ammunition in a temperature-controlled environment before the shot.
Stability Table
| Powder | Stability Rating | Sensitivity (FPS Variation) |
| Hodgdon H1000 | Ultra-Stable | 0.4-0.6 FPS per Degree |
| Vihtavuori N165 | Stable | 0.8-1.1 FPS per Degree |
| Vihtavuori N560 | Moderate | 1.5-1.9 FPS per Degree |
| Alliant Reloder 22 | Sensitive | 2.1-2.6 FPS per Degree |
Powder Comparison
Vihtavuori N560 competes in a crowded market of slow-burning propellants. To understand its position, it must be compared against the primary industry benchmarks for 7mm Remington Magnum and 300 Winchester Magnum class cartridges.
| Powder | Burn Rate | Density | Primary Cartridges |
| Vihtavuori N160 | Faster | 910 g/l | 270 Winchester, 243 Winchester |
| Alliant Reloder 22 | Slightly Faster | 940 g/l | 270 Winchester, 300 Win Mag |
| Vihtavuori N560 | Subject | 960 g/l | 6.5-284 Norma, 7mm Rem Mag |
| Hodgdon H1000 | Slower | 865 g/l | 300 Win Mag, 338 Lapua |
| Vihtavuori N570 | Slower | 970 g/l | 338 Lapua, 300 PRC |
Performance, Metering & Equipment
The physical nature of Vihtavuori N560 requires specific mechanical considerations on the reloading bench. The kernels are relatively large extruded sticks, which means they do not flow with the “liquid” consistency of spherical propellants. In a traditional volumetric powder measure, you may encounter “bridging,” where the sticks catch on one another, leading to inconsistent drops.
For high-precision long-range work, an electronic dispenser is the preferred choice. The RCBS Chargemaster Lite and the Lyman Gen6 Compact Powder System are exceptionally compatible with Vihtavuori N560, as they utilize vibratory trickling to ensure every charge is accurate to a single grain kernel. To achieve the absolute lowest standard deviations, many experts utilize a Frankford Arsenal Powder Trickler to hand-finish each charge to the tenth of a grain.
Fouling with Vihtavuori N560 is moderate. The high energy of the double-base composition ensures a relatively clean burn at higher pressures (55,000-62,000 PSI). However, if the load is too light, combustion can be incomplete, leading to carbon soot in the bore. The use of a quality copper solvent during cleaning is advised, as the high muzzle velocities generated by Vihtavuori N560 can increase copper wash in some barrels.
Case Fill and Ignition Consistency
One of the primary advantages of Vihtavuori N560 is its high bulk density. In cartridges like the 6.5-284 Norma, it often achieves a 95-100 percent case fill. High load density is the key to consistent ignition; by minimizing the air space within the cartridge, Vihtavuori N560 ensures that the primer flame travels through the powder column uniformly. This leads to single-digit Standard Deviation (SD) numbers, which is the holy grail for shooters engaging targets beyond 800 yards.
Recommended Cartridges and Applications
Vihtavuori N560 excels in cartridges with a high expansion ratio or those using heavy bullets that require a sustained pressure curve to overcome inertia.
| Cartridge | Primary Application |
| 270 Winchester | Western Big Game Hunting (140-150 Grains) |
| 6.5-284 Norma | Long Range Benchrest and Hunting |
| 7mm Remington Magnum | Precision Long Range Competition |
| 30-06 Springfield | Heavy Bullet Elk Hunting (180-220 Grains) |
| 300 Winchester Magnum | Extreme Long Range Precision |
| 25-06 Remington | High-Velocity Varmint and Antelope |
| 6.5 Creedmoor | Maximum Velocity Match Loads (Heavy Bullets) |
Bullets
The slow burn rate and high energy of Vihtavuori N560 are perfectly matched to heavy projectiles with high Ballistic Coefficients (BC). These bullets require a sustained pressure curve to reach competitive velocities.
| Bullet Manufacturer | Model | Recommended Weight |
| Sierra Bullets | MatchKing | 142-200 Grains |
| Hornady | ELD Match | 140-208 Grains |
| Berger Bullets | Hybrid Target | 140-215 Grains |
| Nosler | Partition | 140-200 Grains |
| Lapua | Scenar | 139-185 Grains |
Primers
Igniting a nitroglycerin-infused powder like Vihtavuori N560 requires a consistent and powerful flame to ensure complete combustion. The following primers are recommended:
- CCI No. 250 Large Rifle Magnum – Essential for 7mm Remington Magnum and larger cases.
- Federal Gold Medal GM215M Large Rifle Magnum Match – The gold standard for precision magnums.
- CCI No. 200 Large Rifle – Standard choice for 270 Winchester loads.
- Federal No. 215 Large Rifle Magnum – Provides the intensity needed for heavy magnum charges.
- CCI BR-2 Large Rifle Bench Rest – For the absolute lowest velocity spreads in target shooting.
- Remington No. 9-1/2 Large Rifle – Reliable and consistent standard choice for hunters.
- Winchester Large Rifle – Known for slightly hotter ignition that helps with slow-burning sticks.
- Murom Large Rifle – High-quality international option for competitive shooters.
- RWS 5333 Large Rifle Magnum – Elite European primer with extreme uniformity for large cases.
- CCI No. 450 Small Rifle Magnum – For precision 6.5 Creedmoor small-primer brass using Vihtavuori N560.
Expert Verdict
Vihtavuori N560 remains one of the most powerful tools in the reloader’s arsenal for squeezing every bit of performance out of mid-to-large rifle cases. While it requires more attention to temperature variations and barrel heat than modern single-base alternatives, the velocity gains it provides are often the difference between staying supersonic at 1200 yards or falling into the transonic region. For the hunter, Vihtavuori N560 offers the insurance of deep penetration and reliable expansion at extended ranges by maximizing the kinetic energy of the projectile.
The Finnish commitment to quality is evident in every batch of Vihtavuori N560. Its high bulk density, progressive burn curve, and lot-to-lot consistency make it a premier choice for any precision rifle project that demands maximum horsepower. While specialized magnum powders like N570 may offer slightly more for the ultra-magnums, Vihtavuori N560 is the versatile champion for the 6.5mm, 7mm, and 30-caliber families.
Expert Pro Tip: When loading Vihtavuori N560 for the first time, use a bullet seating die to find the “accuracy node” before chasing maximum velocity. Because Vihtavuori N560 is a double-base powder, it reaches high pressures quickly at the top of the charge range. Establishing a stable node at a moderate charge will provide more consistency than “red-lining” your pressure limits. Always monitor for early signs of overpressure such as slight ejector marks or primer flattening as you approach maximum load density in the summer heat. Use a long drop tube to settle the kernels, ensuring a uniform powder column for the best ignition possible.
