Vihtavuori N540 universal rifle powder Vihtavuori N540 is a universal rifle powder for wide variety of medium-sized calibers suitable for both hunting and target shooting. It is an excellent choice for cartridges running from .223/5.56 mm to .308 Winchester and 30-06 Springfield with heavier bullet weights. Vihtavuori N540 delivers outstanding accuracy with exceptionally clean burning. … Continue reading N540 high energy powder