Warning - I would not recommend chasing this cache while the gun range is open. I was hiking along the trail and was about 400 feet from the cache when I heard a zip and then a crash in the woods in front of me. I wasn't sure that it was a bullet until I heard another pop from the range and then another zip and crash into the woods. I immediately turned around and heard round number three hit. It turns out a rifle round makes a pretty distinctive whizzing zipping noise when it goes by you. Most likely some sort of deflection from the rifle range, but nonetheless a bit unsettling! I thought all I had to worry about in the park was feral hogs, bobcats, snakes, and critters!
I have hiked along this trail a few times and never had any issues, but I wouldn't hike beyond the short part of the gun range (after the 50 yd range. I would say the probabilities of any issues is low, but I know I would rather be safe than sorry!