Shooters World 50 BMG Smokeless Powder in 1 lbs canisters. 50 BMG is a medium-slow burning, high density, double base, ball propellant most suitable for .50 Browning cartridge. In addition to nitrocellulose double base powders contain also nitroglycerin (8 - 23 %) as an energetic component. These powders contain also a small percentage of stabilizers or other additives as the single base powders. Double base powders are of higher energetic value than single base powders and their ballistic performance is better.