RE: 40 LB. SET-UP...Best broadhead penetration?
I would say go with eithe a small 3 blade style like the sonics, rocky turbo's nap nitrons etc no more than 1 1/16" cut, or a good high quality cut on contact two blade with no more than 1 1/8" cut. One of my favorites would be the magnus stingers or muzzy phantoms (minus the bleeder blades) Also keep in mind arrow weight is important, so while you may thing a lighter head is better don't overlook going a little heavier, say 125 grns to get more weight on the arrow as well as better FOC.