WARNING- this was shot with a compound, but I think it proves a very good point on how tough Turkeys really are. I think more birds are lost each year due to bad shot placement, which makes it more likely for a pass through, than because the arrow actually passed through! They have very small kill zones, surrounded by heavy feathers and bones. I'm not saying a pass through always means a bad shot, but I have taken a lot of turkeys with the bow, some of the compounds over 80#'s draw weight and have had very few pass throughs
Here are some pics from a good Tom I shot one fall with my bow. The shot was 20yds and he was on a stone wall, level in height with me. I was on the ground. He was facing straight away, getting ready to jump off the wall and down a steep slope. I was shooting my deer set-up. Hoyt Ultra- tech, 70#'s, Axis 340 and a 100grain Wasp Hammer SST. I was getting KE in the high 60's. The shot hit the turkey center as he was facing away. He jumped off the hill and glided on open wings for 200yds. I thought I may have made a bad hit, but upon finding him and cleaning him, this is what I found.
I had centered his heart and lungs. I entered the back of the ribcage and just barely pushed the tip through the front. This is the same set-up that blew through a good bucks ribs at 47yds and still had enough energy to explode the very durable axis arrow on a rock on the other side.
Food for thought.