MR-8600 Military Surplus Gunpowder For Sale MR-8600 Military Powder is a slow-burning, double-base ball powder pulled from U.S. military .50 BMG ammunition stockpiles. Originally formulated for M33 ball and M8 API rounds, it delivers exceptional energy and consistency in large-capacity magnum cartridges. Perfect for .50 BMG, .338 Lapua Magnum, .416 Barrett, and .408 CheyTac, it offers high velocity, tight extreme spreads, and clean combustion. Its spherical grains meter flawlessly and resist temperature fluctuations—ideal for extreme long-range (ELR) shooting and precision rifle builds. Use Hodgdon H870 load data as a direct substitute; always start 10% below maximum and work up carefully. Lot variations are normal with surplus powder—chronograph and monitor pressures. Once abundant and dirt-cheap, MR-8600 is now rare. A true piece of military reloading history—powerful, reliable, and finite. While surplus lasts. Specifications Product Information Quantity  2 – 8 Pounds Delivery Information Shipping Weight 2.135 – 8.000 Pounds DOT-Regulated Yes HazMat Product Yes   WARNING: This product can expose you to N-Nitrosodiphenylamine, which is known to the State of California to cause cancer, and Di-n-butyl phthalate (DBP) or Lead, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to – www.P65Warnings.ca.gov.