I shot my 460WBY, with had an original Wby brake, at an indoor range just for the heck of it. And yes - the 460WBY was permitted at the facility that used a dirt backstop. I took one shot and all the florescent lights immediately went out. As the auto starters were relighting the bulbs, you could see a cloud of dust falling down from the ceiling. My initial reaction was like "Holy [bleep]". I was curious to see if the blast from that rifle/brake would result in the same issues if fired again. Round number two was launched, and the place went momentarily black again. The third shot was just for laughs and brought the range officer around. He asked what I was shooting so I showed him the rifle that I had just cased. I inquired again if there was a rule against rifles like the 460WBY and he said, "no, only 50BMG is prohibited", but he did ask me to refrain from any further fire with the rifle. LOL

Brakes can cause issues on the range. smile