Buckshot is a bad idea for deer, particularly if you are interested in eating the animal- note in the video provided by RMcL that there are hits all across the deer, including at least one in the guts.
If your goal is good tasting meat, then shooting up the eatin' parts and poking holes in the poo pipes is a bad plan.
One hole through the lungs will kill them, without the mess. Buckshot scatters hits randomly ...... making it all but impossible to do just the damage necessary ......
TheGolden Rule of Tool Use: "If you don't know what you are doing, DON'T."