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Winchester S40SWPDB .40 S&W ammunition is a product from Winchester's PDX1 Defender line. Marketed as a top-tier load intended exclusively for personal defense, all Winchester PDX1 ammunition features a proprietary bonding process alongside a split core hollow point projectile with a notched jacket that results in threat-stopping performance. This state-of-the-art load, like all Winchester ammunition, is manufactured in the United States by the Olin Corporation at the Winchester Centerfire Operations Facility in Oxford, Mississippi. Additionally, all ammunition lots are inspected for quality assurance purposes prior to packaging.
The cartridges found in every box of Winchester S40SWPDB .40 S&W ammunition begin with the aforementioned bonded jacketed hollow point projectile, each of which is manufactured using a proprietary bonding process and features a notched jacket for optimal on-target expansion. All cartridges are manufactured to exacting tolerances and boast a ballistic performance on which shooters have come to rely.