Snake shooter
Those CCI shells you found should be perfect. Take some sheets of paper and draw circles the size of a snakes head. See how your gun patterns at different ranges from 2 steps to 6 or 7 steps away. The goal is to put a large portion of the shot in the head.
This will show you your maximum effective range. If you run across a snake that is outside that range you can either choose to get closer and kill it or, walk away safely.
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