20g home defense rounds?

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Be sure to pattern whatever you get. Take it to max distance possible and see what it does. It may not do all that much damage @ long range because of the massive velocity drop off but it's good to know how many pellets are on average hitting the target and whats not.

Try as many different loads from as many different manufactures as possible. I have about one dozen boxes or so of 12 ga left over from my test.