I got to sit about 40-feet from a fellow sighting in a 50-cal over the weekend. I did a really good job of shaking the dust off my pant's legs. The concussion wave starts at the rifle and you can SEE it pass over the grass and camp fire ashes. You can FEEL it when it hits you. Sort of like going to the Rodeo.......once you've been, there may be little NEED to go back for a while. piper