This sound effect can be found on 20th Century Fox Sound Effects Library, which was made by Sound Ideas.
First recorded: April 20, 1971
Creator: William Randall
Owner: Warner Bros. (April 20, 1971-1995), Sound Ideas (1995-present)
Origin: San Francisco, California
Year debut: December 23, 1971
First heard: Dirty Harry (1971)
Area used: Worldwide
On April 20, 1971, William Randall created this sound effect by using a .44 Magnum hand gun. Originally a Warner Bros. sound effect; it debuted in Dirty Harry on December 23 of the same year. Then, it appeared in many different action films throughout the 1970s to the 1990s.
In 1995, Sound Ideas added this sound effect to the 20th Century Fox Sound Effects Library.
Links:
https://soundeffects.fandom.com/wiki/Sound_Ideas,_GUN,_HAND_GUN_-_.44_MAGNUM:_SINGLE_SHOT_01#Audio_Samples