Killing the dark ones.

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Did pretty well for a 2 hour pest hunt at the farm. Same rules as last time. Only shoot the dark birds. We are attempting to make a white flock. Shots taken from 15-60 yards. I had two times where I got two with one shot using the huntsman regal .22 with Jsb 18.1gr. One of the birds has a deformed foot. Any idea as to what caused it?