True we do try and shoot turkeys in the head...but some fail to remenber we are shooting a shotgun with an ever growing pattern. If you only hit the head then the rest of your 20 to 30 inch pattern is going somewhere.
I'd rather not deal with hundreds of small pellets in and through my meat...the best range to shoot a turkey is between 25 to 35 yards. A #4 lead is devastating at those ranges and if a few get in the meat they're not hard to find...and if you miss judge the yardage the #4 will not let you down