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Winchester smokeless powder has been around since the late 19th century. Customers who fire factory-loaded ammunition in Winchester know that they are getting propellant quality from the moment the first shot is fired. Bring this quality to the reload bench using Winchester family powders. The 296 powder was developed for the 357 Magnum and 44 Remington Magnum ammunition. Winchester also recommends this propellant for use with 410 bore AA loads.