personally i like a bow between 40-50 lbs for turkey, i dont like thru shots on them.
i like my arrow to stay inside to help tear them up since they have a small vital area. ideally a spine shot to drop them right away,but they don't always give you that opportunity. or you can just go for head shots and that way you don't have to worry about losing a wounded bird with a arrow stuck in him,that way its either clean miss or clean kill(my preference). what ever you chose for bow weight and shot placement. good luck they are not as easy as a lot of people think,especially on public land where the pressure gets high.
oh yeah i also think that the only way to hunt buzzards is with a bow,i don't like the taste of lead in my buzzard meat.
PEACE,
Tim