RE: How to choose the right arrow & tip?
The head and neck are good targets, if you can get a turkey that will cooperate and hold his head and neck still while you aim and shoot. Another option is to use a big mechanical broadhead and shoot at his wing butt. Nock out his flight capability and lay his tail on the ground.
You don't have the power to use mechanicals on deer, of course, but we're talking turkey here. You WANT limited penetration and maximum shock in turkey hunting, so a wide cutting, 3-blade mech fits the bill perfectly.