I think John is right. 6's will be fine. We did a tower shoot in Michigan in snow a few yrs back. What a hoot it is when a bird flies around the entire circle and at least 12 guns miss him! Sounds like WWIII. We had every shot you can imagine but mostly incoming, but they could be sky high or right on the deck coming straight at you. Never felt the need for heavy loads for sure. Most shots were within 35yds. It was the higher overhead oncoming birds that eluded us the most; I shot the tail clean off one. When we missed those it was always because we were behind them.
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