Alliant Smokeless Magnum Rifle Powder 33 has a solid guarantee from a company with more than 100 years of experience in the industry. The powder is required to pass strict quality control measures that ensure consistent performance and accuracy.This particular powder is designed with impregnated kernels and boasts quality burn rate control elements. It offers a consistent pressure curve along with a delayed spike. With this up to 150 feet per second is added to the velocity over competitive powders. This powder is used for the .337 Lapua Magnum but also works great with various other large-capacity and ultra-magnums.