VihtaVuori N565 Smokeless Powder 8 Lb by VihtaVuori now carries the VihtaVuori N565 Smokeless Powder 8 Lb. This N565 was created especially for the .338 Lapua Magnum with 250 grain ammunition. Specifications & Features: Temperature stable Improved hygroscopic stability New decoppering agent to ensure a cleaner barrel when shooting Flows smoothly through powder measures Single perforated extruded powder