Vihtavuori offers two rifle powders(Vihtavuori 24N41 For Sale ) specifically for the .50 BMG case; 24N41 and 20N29. These are single-based treated powders, having very large grain size and  extremely slow burning rates ideally suited to the .50 BMG. They also have some application in a few other very large capacity cases, such as the .338 Lapua Magnum and the .30-378 Weatherby Magnum. Of the two, 24N41 is slightly faster than 20N29, with renewed relative burning rates 39 for the 24N41 and 36 for the 20N29, when N110 is given the index 100.

Important Information On Vihtavuori 24N41:

• Do not exceed the loads displayed in the reloaders guide.
• Never mix any two powders regardless of type, brand, or source.
• Never substitute any smokeless powder for Black Powder or any Black Powder substitute.