Don't have them in front of me now, but were a couple done in Missourri, I believe, about 20 years ago. One may have been in Minnesota. Regardless, the findings were the same in both. The higher the technology/more technology used, the higher the wounding rate. Pretty much a linear graph with compound shooters using sights and releases wounding the most, followed by compound finger shooters, then recurve shooters, then longbows. Those who used the highest tech equipment, i.e., compounds with sights and releases, also killed the most animals. In summary, they took more and longer shots, killed the most animals and wounded the most animals.
I have these studies squirreled away in my files and haven't looked at them for more than 10 years. Maybe someone else can provide a reference or can point to more recent studies.