Vihtavuori N350 is the slowest-burning propellant in the N300 series, specifically engineered for high-energy handgun loadings and heavy hunting shotshells. Positioned at the top end of the burn rate scale for pistol powders, it is the premier choice for reloaders seeking maximum muzzle velocity and energy in powerful handgun cartridges without sacrificing the clean-burning characteristics Vihtavuori is known for. It serves as a superior alternative to domestic powders like Alliant Blue Dot, Accurate No. 7, and IMR 800-X.
Ideal Applications and Calibers
N350 is optimized for “high-intensity” rounds where a slow, progressive pressure curve is required to push heavy bullets to their full potential. It is particularly effective in:
- 9mm Luger: N350 is a favorite for high-velocity 115gr, 124gr, and 147gr loads. It is widely used in Practical Shooting (IPSC/USPSA) to achieve “Major Power Factor” safely and accurately.
- 10mm Auto: This powder is arguably the best choice for the 10mm, providing the necessary energy to drive heavy 180gr and 200gr bullets for wilderness protection or hunting.
- .45 ACP: It excels in +P loadings and heavy-bullet target loads, offering higher velocities than faster powders like N320 while maintaining consistent pressures.
- .38 Super and .357 SIG: The slow burn rate is perfectly matched to these high-pressure cartridges, delivering exceptional accuracy and speed for competitive and defensive use.
- Magnum Revolvers: While N110 is often used for top-end magnum loads, N350 is an excellent choice for “medium-heavy” loads in .357 Magnum and .44 Magnum, providing high energy with less muzzle blast than slower rifle-type powders.
- Heavy Shotgun Loads: N350 is one of the few handgun powders that doubles as a high-performance shotshell propellant, particularly for heavy 36g (1 1/4 oz) or larger hunting loads in 12-gauge.
Physical Characteristics and Metering
N350 shares the same physical dimensions as its faster siblings (N320, N330, and N340), featuring extruded tubular grains that are 1.0 mm in length and 0.8 mm in diameter.
- The Porosity Difference: What sets N350 apart is its reduced porosity, which slows the burn rate and allows for the safe generation of higher pressures over a longer duration.
- Consistent Flow: The uniform grain size ensures that N350 flows smoothly through volumetric powder measures, allowing for high-speed reloading with minimal weight variation between charges.
- Graphite Finish: A modern graphite coating is applied to eliminate static electricity, ensuring the powder drops consistently and stores safely.
Clean Burning and Barrel Protection
True to the Vihtavuori N300 series, N350 is remarkably clean-burning, leaving very little carbon or unburned residue in the firearm’s action or bore.
- Decoppering Agent: It includes a modern decoppering additive that deters the adhesion of copper jacket material to the rifling. This helps maintain accuracy during long strings of fire and simplifies barrel maintenance.
- Low Muzzle Flash: Compared to many competitive slow-burning pistol powders, N350 is engineered to produce less muzzle flash, a critical advantage for defensive applications and low-light shooting.
Temperature Stability
N350 is designed to be highly temperature-stable, ensuring that maximum loads developed in mild weather do not become dangerous in high heat, nor do they lose significant velocity in sub-zero winter conditions. For the serious reloader, this predictability is essential for maintaining a consistent point of impact and reliable cycling in semi-automatic platforms.
