Yeah, and a lot of PCP (precharged pneumatic) airguns shoot supersonic speeds too. Even in .308.People justtune them back to below 1100 fps to prevent sonic cracks and pellet wobble caused by breaking the sound barrier. Either way, they both have theiradvantages. The airgun is quiet, light, recoil-free, safer, more accurate (why do you think the Olympic shooting teams use them for 10 meter comp? .10" ctc groupings at 20 yards, that's why), better for suburban use, and cheaper to shoot. The powder burner is faster, bigger, and comes in semi auto (semi-auto air rifles worth hunting with are very expensive). Personally, there is no where to shoot a powder burner here in Socal legally (except a few designated shooting areas that entail 50 guys in a line blasting with shotguns and 9 mm's), so I use air.