I find this shot size discussion interesting. Old man Lynch, of the "Lynch box call fame" said "there isn't a turkey alive that can withstand a load of 7 1/2's in the head at 30 yards or so" but he did not say out of what choke. I have killed several with 7 1/2's called in at under 30 yards and they died right there. I dont think I would go below 6's for a well called in tom what with decoys and all.
I'll be shooting 7 1/2's out of all my guns this year and likely will use either my Parker GH, Meriden or Lefever. The Meriden is the killer.
JMHO