Ashby's studies are nothing new and ground breaking. I'm pretty sure the use of 250 gr + broadheads was the norm when I started shooting 25 yrs or so ago. It's definitely nothing new.

Will you find a study on it? Probably not due to the fact that the majority of the hunters shot heavy arrow set-ups. When I started 2-blade broadheads where the norm even for aluminum arrows. Bear broadheads and the like dominated the market. Therefore, why would you have to write a study to prove otherwise. In addition, this norm was way before the internet. Therefore, any studies are buried somewhere in someone's house.

Plus, I thought this thread had to deal with shooting form?