Buckshot differs from Bird-shot in that Buckshot is on the larger end of the size scale, and it is swagged "pure", soft lead while cold. Whereas Bird-shot is poured from molten lead from a shot tower, with added elements to effect the properties, namely hardness (Antimony), and roundness via increased surface tension (Arsenic). Buckshot differs from "Round Ball" (a single round ball), in that a loading of Buckshot always contains multiple projectiles of less than bore diameter.
Sometimes you get what you pay for, sometimes you only pay more for what you get.
Three shots are not a "group"...they are a "few".
If the Bible is the literal, infallible, unerring word of God...where are all those witches I am supposed to kill? (Exodus 22:18)