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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:
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.