These 2-3/4" shells fire larger pellets than most steel loads and work well against larger waterfowl due to their higher penetration. However, #4 birdshot is not powerful enough for self-defense (and is not to be confused with #4 buckshot, which is roughly twice its diameter).
Winchester shotshells are loaded in Oxford, Mississippi at a state of the art facility built in 2011. Winchester is a longtime division of Olin and has produced countless shells and cartridges for hunting, self-defense, law enforcement, and military use.
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