Fred, I use 7 oz. Herman Oak leather from Springfield leather. that weight seems to work for me for skinners and hunters with 3.5 - 4" blades.
I agree with John about Tandy, while their leather is good for just starting out doing leather work due to screwing things up for a while, their leather has a lot to be desired in my opinion.
For one thing, it's imported from Mexico so there's no guarantee on the tanning process, with some weird things going on in the texture and dyeing of it. It also seems to have a lot of range marks on it, bug bites, barb wire marks, and other stuff that just shouldn't be there.
Some may disagree and like it, but once you unroll a side of Herman Oak after using Tandy leather you will be amazed at the difference in quality and the way it stamps, carves, and takes stain or dye.