A Federal .45 ACP HST bullet (P45HST2) emerging from, but still in, the 5" barrel of an S&W Model 4506, complete with gas being blown ahead of it. (Average muzzle velocity 900 fps, 414 ft-lbs of energy, and 21,000 psi.) Note the amount of infrared light that's being emitted around the bullet, and the little smoke plume above the ejection port. The action was caught using an invisible infrared trigger beam system (1,000,000th-second response time). Flash duration was 1-2,000,000th-second.