American-made powder designed for magnum rifle calibers, Alliant Power Pro 4000-MR Powder has become a preferred choice. Because this powder produces better velocity and density, it is easier to meter. To ensure superior performance for .300 Winchester Magnum and 7mm cartridges, the powder undergoes extensive testing in a ballistics laboratory.
WARNING: This product can expose you to chemicals that are known by the state of California to cause cancer and birth defects or other reproduction harm
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