Where does everyone get the idea that you gotta have 3 1/2" ammo and #2 shot to kill a turkey?

I have killed numerous birds with plain Jane ol' #8 lead shot in standard 2 3/4" ammo.

It only takes one pellet to the brain or to disrupt the CNS to anchor a bird. Turkey bones are NOT made of steel!

"Pattern density kills, not shot size."

I want as dense a pattern as possible down range.