As the Handgun Hunting Consultant to the SCI Record Book Committee, I am happy to see a discussion on the Record Book merits!
I would just like to make a couple clarifications and comments:
The SCI Record Book of Big Game Animals (RB) does record and separate the method of take for every huntable trophy animal species in the world. So, all Handgun entries are listed in the book separate from the rifle, muzzleloader, bow, etc.