Starling took it hard!

40yds....18gr at 925fps right to the forehead....blew both eyes out and left a nasty exit wound.

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Would this be caused by hydrostatic shock?

None the less, well done!! Any dead starling is a good thing. 

Hydrostatic shock

Firearms

Hydrostatic shock is the controversial concept that a penetrating projectile can produce a pressure wave that causes "remote neural damage", "subtle damage in neural tissues" and/or "rapid incapacitating effects" in living targets. Wikipedia