Back when I first got into the 308 ARs, I had a DPMS build with a JP Enterprises large profile compensator installed. The first time I took that build to the range, I laid down prone beside my shooting bench to get stable and shoot from the bipod. As I laid there loading my mags, a gentleman moved into the shooting bench adjacent to mine and began organizing his gear on the bench. I inserted a freshly loaded mag and proceeded to begin sighting the scope. Every time I pulled the trigger there was a massive concussion, followed by the 'tink' of expended brass, and then shortly after that a different sounding random 'thwock thwock'. I didn't pay attention at first but after about four shots I distinctly noticed a lot of commotion at the adjacent shooting bench. I picked my head up after my 4th shot just in time to see more loaded ammo rolling off the neighboring bench as the man at the bench scrambled to keep his gear from running away with each shot. I stopped firing, helped him retrieve his gear from the ground, and helped him move to the far end of the firing line. He didn't really complain, but he asked "just what the hell are you shooting there sonny?", and he was baffled when I told him it's just a 308. He didn't even know they made ARs in 308, and came back to look it over.