When I started shooting at the GPSR, it was out in the country. Now, it has been enveloped by subdivisions.
Remember, the range is in a flood plane, so there's probably not a lot behind those berms. Besides, the berms aren't really any lower than others I've seen.
This isn't the first accident there, and I doubt it'll be the last. Earlier this summer, a shooter was putting his loaded handgun into a soft case after a day of shooting. Shot himself in the gut, died 6 hours later at Parkland.
I truly hope Jim comes out of this alright.