There are a number of variables that must be taken into account for sure. One not mentioned is temperature. While it's not gunfire, I do recall overhearing a conversation that took place a mile away. The folks were talking plainly. It startled me to hear them talking as I had just come out of the house. Conditions: Calm, night, and -40F. The only time it happened, but it did. Spooky too.
And as has been stated, gunfire, at least the muzzel blasts, can be heard at some distance. I think the chart is a good starting point, and for game use quite good. As the HoG, you can always add or subtract from the ranges. I have heard gunfire at ranges over two miles from high-power rifles.
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