The big waterfowl bore, kept alive by goose hunters and the steel-shot era that made its payload advantage matter. Modern 3½-inch 12 Gauge loads took most of its market, and the 10 survives as a specialist's shell.
Expect 3½-inch magnum waterfowl loads to dominate what shelf space exists. Supply is thin and seasonal — when your load appears in quantity, that's the buy.
