20th century? Maybe -
Charles Askins -
"Askins was controversial for the relish with which he described the numerous fatal shootings in his law enforcement and military careers, stating he had killed 27 men.[1][4] Because he was involved in numerous shootouts along the US/Mexico border, and due to his stated practice of not keeping track of African-Americans and Hispanics, the actual number of killings he committed was potentially much higher.[1] Askins once remarked that he thought he was a psychopathic killer, and that he hunted animals so avidly because he was not allowed to hunt men anymore.[1] Askins was a contemporary of Bill Jordan, Elmer Keith, Skeeter Skelton, and Jack O'Connor.[1] These people, except for Skelton, as well as Askins, Audie Murphy, and Ed McGivern, were used as inspiration for characters in the Stephen Hunter novel Pale Horse Coming."
en.wikipedia.org/wiki/Charles_Askins .
www.tactical-life.com/firearms/col-charles-askins/ .
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Carlos Hathcock -
"During the Vietnam War, Hathcock had 93 confirmed kills of North Vietnamese Army and Viet Cong personnel.[4] In the Vietnam War, kills had to be confirmed by an acting third party, who had to be an officer, besides the sniper's spotter. Snipers often did not have an acting third party present, making confirmation difficult, especially if the target was behind enemy lines, as was usually the case.
Hathcock estimated that he had killed between 300 and 400 enemy personnel during his time in Vietnam.[5]"
en.wikipedia.org/wiki/Carlos_Hathcock .
