Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
Vihtavuori N555 powder targets precision rifle cartridges where case volume runs large and bullet diameter stays comparatively small. The 6.5 Creedmoor represents the primary application — the powder delivers temperature-stable ballistics across field conditions ranging from sub-zero mornings to summer prairie afternoons. Competitive PRS shooters and long-range hunters working with 6mm Creedmoor, .284 Winchester, .260 Remington, and .30-06 Springfield will find similar performance characteristics. Energy content measures 3700 joules per gram, bulk density comes in at 900 grams per liter, and the burn rate falls between Vihtavuori N550 and N160.
Performance Profile
The formula incorporates an anti-fouling additive that reduces copper and carbon buildup in the bore. This extends the round count between cleaning sessions during multi-stage matches and keeps point-of-impact shifts minimal as the barrel heats. Lot-to-lot consistency eliminates the need to re-develop favorite loads when you open a fresh container — charge weights that delivered 2750 fps in your last batch will repeat in the next. Vihtavuori maintains tight manufacturing tolerances across production runs, and the company subjects every lot to ballistic testing before release.
Specs at a Glance
| Spec | Value |
|---|---|
| Energy content | 3700 J/g |
| Bulk density | 900 g/l |
| Burn rate | Between N550 and N160 |
| Primary calibers | 6mm Creedmoor, 6.5 Creedmoor, .284 Winchester, .260 Remington, .30-06 Springfield |
| Available sizes | 1 lb, 1 kg, 8 lb |
| Manufacturer | Vihtavuori |
Temperature stability stands as the defining feature. Extreme spread on velocity holds tighter across a 160-degree temperature range than competing powders, which translates to predictable come-ups when you zero at 70°F and shoot a match at 20°F. Competitors running 6.5 Creedmoor in PRS Gas Gun or NRL Hunter divisions will see fewer flyers when ambient conditions shift between stages. Browse additional gun powder options to compare burn rates and energy content across the Vihtavuori lineup.
Safe Handling & Compliance
Smokeless powder is a federally regulated explosive. Store in a cool, dry location away from heat sources, open flame, and sparks. Do not mix powders from different containers or manufacturers. Always consult current load data from the powder manufacturer or a published reloading manual before developing loads. Start at the minimum listed charge and work up in small increments while monitoring case head expansion, primer condition, and extraction force.
- Store powder in original containers with legible labels — never transfer to unmarked bottles
- Dispose of old or contaminated powder per local hazmat regulations — do not burn in open containers
- Work in a well-ventilated space and keep a fire extinguisher rated for Class B fires within reach
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