Originally developed for 7.62x51mm NATO M80 ball, Vihtavuori N135 Universal Smokeless Rifle Powder is modern gunpowder for a wide range of calibers from .222 Rem to .458 Win Mag. N135 is a tubular powder with 1.0mm grain length and 0.8mm grain diameter. Ideal for medium-game hunters and long-range target shooters. Works with a wide range of calibers from .222 Rem to .457 Win Mag Ideal for medium-game hunters and long-range target shooters Tubular powder with 1.0mm grain length and 0.8mm grain diameter Medium burn rate