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Light guns, big loads. The kids today (me included) would be battered and bruised by a day of this.

Those "big loads" with the bulk or dense smokeless powders of the day were at lower velocity than most all of today's loads and even in a big shoot like the GAH you would only fire at most 50 shells at your 25 birds, likely spread over two days. More time spent placing bets than actually shooting.