How to kill a rooster with a shotgun?

So, we have a rooster who is constantly attacking people whenever we go near the coop to collect eggs. We need to put him down and I want to do it humanely. I've never killed a rooster before and don't know how. And I've read about grabbing them when they are asleep and then chopping their heads off. I... show more So, we have a rooster who is constantly attacking people whenever we go near the coop to collect eggs. We need to put him down and I want to do it humanely. I've never killed a rooster before and don't know how. And I've read about grabbing them when they are asleep and then chopping their heads off. I just don't know if I have the heart to do it. I know that makes me sounds weak but whatever. So would using slugs or birdshot be better? And I don't think we really care too much if we get to eat him or not. But he needs to go as he not only attacks us but the hens he is with too.
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