A pump will work great - except perhaps for the cumulative recoil & resulting bruising effect of that many shots with 12 ga. So, is the weather going to be cool enough to comfortably wear a vest with extra padding in the shoulder? If so, I'd just do that and take the pump. If wearing a thin shirt, you might take their advice, and rent or borrow a semi-auto 20 ga, to reduce the recoil. 300 shots per day times 5 days is a lot of fun, but may start to hurt after awhile.
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