Vihtavuori's N550 high energy powder is a slower burning powder, very well suited to reloading a wide range of medium to large cartridges especially with heavier bullet weights. The N550 is an ideal fit for many of the 30 caliber magnums with lighter bullets, but also useful across a wide range of bore sizes in various shooting disciplines. Particularly well matched to heavy bullet loadings in the 6.5x55 and .30-06 Springfield cartridges.