The Gobbler Getters are deadly on turkeys! I have shot a lot of turkeys over the years with many different broadheads and my favorite head for body shots is the NAP F.O.C. (Freaking Outrageous Cut) which is the 3" cut 2 blade version of what your father purchased.
I have shot many with the standard 3 blade gobblergetters as well. You will not be disappointed with the results. The blunt tip pushes the soft skin and meat tight before the blades get to open therefore cutting an even bigger hole then the advertised cut and yes I can attest to the shock this head delivers!
Do a search on youtube for gslam95 and you can see a couple of Ocellated birds I took with the spitfire Gobblergetters, it puts them down fast.