I just saw your post and I thought I would offer a quick photo I just took of a caping knife that I made a few years ago. I made one of these for my son to use for caping chores ( also one for me, shown ). It is 6 3/4" overall, the cutting portion is 2 1/2" and the blade including the choil is 3 1/8". Because this knife is so compact, my son uses it for field dressing his deer. It has become one of, if not his favorite knife for field dressing deer. The blade is 1/8" D2, Paul Bos heat treated.
Gee I just realized that I cannot post a picture. I'm not allowed to add an attachment? Sorry.