Originally developed for 5.56 Nato cartridge, Vihtavuori's N133 is a multipurpose rifle powder for centerfire .22 cartridges and PPC caliber cartridges. N133 is a tubular powder with grain dimensions of 1,1 mm length and 0,8 mm diameter. The burn rate is medium in the scale of our rifle powders, and it works like a charm with .223 Remington, and practical shooters and other using the AR-15 will know the utmost quality of the N133. It is also a supreme choice for handloaders shooting 6 PPC standard rifle, and benchrest shooters all over the world rely on the combination of the Lapua .220 Russian brass and Vihtavuori N133 powder.