I got a couple, though one is slightly off topic.
This first one is about an incident that occurred while I was squirrel hunting some 25 or so year ago. I was down in a thick ponderosa pine forest shooting squirrels with my compound bow. This was something I had done before, lots of fun, but shafts returning to earth can pose a deadly risk. So to remedy that, I never took shots that were at near vertical angles and well angled at no more than approx 75 degree angles. Well one afternoon while hunting like this, I took a shot from probably 200 - 300 yards down in a canyon, and then in what seemed like a few seconds later I heard a distant "BAM".
The only thing I could think of that was up on the flats above, would be my truck. But I really couldn't imagine having hit my truck, I figured it was way beyond the range of a stray arrow. To my complete surprise I had an aluminum arrow sticking dead center in the hood. And considering how thick the hoods were on that old 1969 GMC truck, i was really surprised it actually drove all the way in, stopping only when it slammed into the block.
The other incident was while deer hunting with my brother in law in 1970. We had stopped to take a break at an old abandoned cabin, and I was sitting against the exterior of the chimney, out side in other words, with my back against the dilapidated rock & concrete chimney. All of a sudden, I get hit in the face and neck with rock and bullet fragments, which happened simultaneously of hearing the thwack sound of the projectile impacting the large rock my head was up against.
I was with my brother in law, and also a best friend, both of which said they never heard the report of a rifle. And even though I was in obvious shock, I was certain I never heard the report of a firearm. All I could conclude is someone fired a round from the other side of the mountain, and then it just traveled unobstructed for a few miles. But one must also consider that a bullet from a high powered rifle leaving the muzzle at over 3000 fps, and possibly having the advantage of angle enhanced trajectory, it might be capable of traveling 5 or 6 miles, maybe more depending. At 5 miles away, it takes the sound of the firearm discharging a good 26 seconds to reach you, and that's if it even reaches you at all.
GS