Vihtavuori N160 is a slow-burning, single-base smokeless powder designed specifically for rifles with large case capacities and relatively small bore diameters. Positioned as a premier choice for big game hunting and long-range target shooting, N160 is optimized for “overbore” cartridges and magnum calibers where a controlled, progressive pressure curve is required to maximize muzzle velocity without exceeding safe pressure limits.
Optimal Applications and Calibers
N160 is exceptionally versatile within the medium-to-slow burn rate category, making it a “go-to” propellant for many of the most popular hunting and precision cartridges in the world:
- 6.5×55 Swedish Mauser: N160 is arguably the most famous powder for this caliber, providing excellent case filling and superb accuracy for target shooting up to 800 meters.
- 6.5 Creedmoor and .260 Remington: It is an ideal solution for shooters using heavier projectiles (140gr+) in these popular 6.5mm rounds.
- .270 Winchester and .25-06 Remington: These classic “small bore/large case” hunting calibers thrive with the slow burn rate of N160, especially with mid-to-heavy weight bullets.
- Magnum Calibers: It is particularly well-suited for belted magnums such as the 7mm Remington Magnum, .300 Winchester Magnum, and .338 Winchester Magnum, as well as modern short magnums like the 7mm WSM and .300 WSM.
- Standard Long Actions: In the .30-06 Springfield, N160 is an excellent choice for shooters utilizing heavy bullets (180gr to 220gr) for large game hunting.
Physical Properties and Performance
As a member of the N100 series, N160 is a pure nitrocellulose powder, which contributes to its reputation for consistency and barrel longevity.
- Grain Geometry: N160 consists of extruded tubular grains (1.3 mm in length and 1.1 mm in diameter). This size ensures high bulk density and excellent case filling, which is a key factor in achieving low velocity spreads and high accuracy.
- Clean Burning: Vihtavuori powders are renowned for their purity. N160 produces minimal carbon fouling and includes a modern decoppering agent that prevents the build-up of copper jacket material in the rifling, extending the intervals between cleanings.
- Temperature Stability: The powder is engineered to be insensitive to temperature fluctuations. This ensures that a precision load developed in mild conditions will maintain its point of impact during freezing winter hunts or high-heat summer competitions.
Comparisons and Loading Considerations
On the relative burn rate scale, N160 occupies a space similar to Hodgdon H4350, IMR 4831, and Alliant Reloder 19. While some older charts may place it closer to the very slow H4831, modern ballistic data and user experience suggest it behaves more like the 4350-class powders in many common applications.
Because N160 is a slow-burning propellant, it is most effective in rifles with standard-to-long barrel lengths (24 inches or longer), where there is sufficient time for the powder to burn completely and generate maximum velocity. For hunters and competitors seeking a reliable, temperature-stable, and clean-burning powder for their large-capacity rifles, N160 remains a gold standard in the reloading community.
