Maybe too late already, but ... if I lost big game as often as I lose turkeys, I'd have to quit bowhunting. I've tried penetration limiters and still get pass-throughs. Only birds I always recover are those where the arrow stays in -- like when I'm shooting downhill and the ground stops the arrow, or I pin 'em to a tree. I absolutely want the arrow to pass through but stay in, to prevent them from flying and slow or stop their running off. Other hunters I know, like Don Thomas, shoot their usual 2-blades and get pass-through and good recover. They must be better shots than I am, as a turkey has about a 3" heart/lung quick-kill zone. Every year I try something different in the way of heads, but I think the best bet is to use a lighter bow and really big multi-blade heads, if you can get them to fly well. Good luck, and thanks for being conscientcious. Dave