What's a good way to tell how far a gunshot was?

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After an hour or two walking past the factory, looting a nearby village, walking to Solnechya, looting infected medical personal, getting sick on some rotten fruit (I really thought I understood on eatting small increments. But I may have taken too many bites from it), struggled to find the water pump, then butchered another chicken before leaving for Dolina. Around one of Dolina's bars, I heard two shots come from the unnamed village between Dolina and Solnechya. Cue me running straight for ...