Vihtavuori N550 High Energy Smokeless Rifle Powder 1 lb is a high-energy rifle powder for reloaders developing heavier-bullet loads. Its slower-burning formulation suits medium- to large-capacity cartridges, including heavy-bullet loads in 6.5x55 and .30-06 Springfield. Versatile performance supports use across a range of rifle calibers; consult published load data for your specific components.