RE: BOW HUNTING QUESTIONS!!!
If I were you, with a 40 pound draw weight I would go with Magnus Stinger 2 blade heads with the bleeder blades. They are regular 2 blades with 2 other small blades for extra cutting for more blood. They fly just like a fieldpoint, are razor sharp, and pretty much undestructable. If you happen to break one magnus will replace it free! I shot these heads last year and love them, but never killed a deer with them. Ive heard nothing but good about them.
Even With your 40 pound draw weight, they will penetrate more than enough.