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.
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.
He was taken to the same hospital where, coincidentally, his convalescing wife and third child were already admitted, where he clung to life for another two days. Friends and reports say he remained in excellent spirits throughout the ordeal, even after losing his foot, cracking jokes and remaining conscious, until finally after reaching a temperature of 107.5 and a pulse of more than 175, he spoke to his wife for the last time and died. After being picked up off the road with the mangled left foot - reports say he said to his friend "well, looks like more roadwork."
The buckshot punch goes to show the effectiveness of a good feint or deception plan. If you can prevent your opponent from seeing what's coming, you can expect outstanding results. While I was unable to find a good example where Stribling was using this punch, this match between Stribling and Jack Sharkey gives you some idea of what kind of fighter he was. (Stribling is the skinnier of the two)
His excellent defensive skills and tendency to run in and clutch meant he never received a permanent scar throughout his career. One unverified story reports that Stribling would use inexperienced black men to practice his knockout punches. He would put them in the ring and practice knocking them out using punches like his buckshot punch. One day, he met laborer, 25 year old John Linwood Fox as a sparring partner who had figured out how to defeat his buckshot punch. Fox stepped into the jab delivering a straight left of his own which knocked out Stribling and earned him a shot at a professional boxing career. (although it promptly had him kicked out of Stribling's camp).