The buckshot punch was introduced to boxing in the 1930's by William Lawrence "Young" Stribling Jr, a Georgian heavyweight. Consisting of a left jab, then the slightest hesitation to feint a right, immediately followed by a full blown right cross, it became a trademark punch that earned him over 100 KOs.
Young Stribling
Stribling had 290 fights over his professional career and wasn't finished when he was killed in a motorcycle accident. According to BoxRec biograhies, Stribling was travelling about 35mph on his bike, waved to a friend in a passing car but failed to see a following car. Reacting, but too late, he struck the car where the bumper crushed and nearly tore off his left foot (later to be amputated) sending him crashing to the pavement smashing his pelvis.