A Case of External Beveling with an Entrance Gunshot Wound to the Skull made by a Small Caliber Rifle Bullet.Baik, Sung-Ook M.D.; Uku, Justin M. M.D.; Sikirica, Michael M.D.American Journal of Forensic Medicine & Pathology: December 1991 International Registry of Unusual Cases: PDF Only Abstract The external beveling caused by an entrance gunshot wound to the skull has not been completely explained, but the mechanism is probably a combination of several factors including the angle of shot, twisting force of a rotating bullet, blow-back effect, velocity, shape and size of the bullet, outspread of the kinetic energy from the bullet, and resistance of the skull. (C) Lippincott-Raven Publishers.