Im not 100% sure, but I think it is because he killed the mad dog in one shot. Scout and Jem thought he was boring, and they were surprised to see how good of a shot he was when he shot the dog.
Atticus's nickname is "one shot" finch.
Atticus was nicknamed 'One-Shot Finch' at the Landing because it was said he was such a good marksman that he only needed one shot to bring down game.
Atticus's nickname at one time was One-Shot Finch because he can take out his target with a gun with only bullet like when he had to shoot the rabbid dog called Old Tim Johnson or something like that.
one shot atticus
The nickname you are referring to belongs to Atticus. The Nickname was actually 'One shot Finch' and he is called this because of his accuracy with a gun.
The children learned that Atticus's nickname was "One-Shot Finch" because he was known for being an expert marksman who could hit any target in just one shot.
Mr. Heck Tate calls Atticus "Ol' One-Shot," referring to Atticus's excellent marksmanship and reputation as a skilled shooter.
Atticus
Miss Maudie tells Jem and Scout that Atticus's nickname was "One-Shot Finch" to highlight his exceptional marksmanship skills as a young man. This anecdote also serves to emphasize Atticus's humility and the importance of not bragging about one's abilities.
dead shot finch one shot finch
In the novel "To Kill a Mockingbird," Ol' One Shot refers to Atticus Finch. This nickname alludes to his marksmanship skills, particularly his ability to shoot accurately with one shot, as demonstrated in the story. It symbolizes his moral and ethical character, as he aims to protect the innocent and uphold justice.
Heck Tate insists Atticus shoot the mad dog because there is only one chance to kill it. We learn that Atticus is an excellent shot, and that he was called "One Shot Finch".