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Are you using it for the pelvic bone? I can't remember the last time I split the pelvis on a deer....maybe 15 years ago.
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I'll second this! I field dress all my deer (and seems like all of my hunting buddies deer
) with an Old Hickory brand model Ontario 615. It's a double blade folder given to me by my late daughter. The blades are narrow and about 4 inches long. I "rim the vent". I stand over the deer, facing the direction it came from, then put it's back legs behind mine so that the rear is tilted up. Cut around the skin around the anus. Gently pull the anus out while you cut around the tissue that connects it to the pelvic "tube". A four inch blade will usually cut it free enough that it will pull back through the pelvis in later steps. It isn't a bad idea to carry a short section of string to tie off the anus so it does not loose anything as you pull it back through the pelvis later.
It's a good idea to save this as a last step to prevent contamination of the meat.
I adopted this after seeing people get injured trying to hack through the pelvis with knives, hammering on them, etc. Thought there had to be a better way.
I also don't split the ribs. I feel for the sternum (the cartilage tab at the end of the rib cage), then cut in below there. Cutting in right here should give you access to the diaphragm. I then cut the diaphragm so I can reach up and grab the heart with one hand while reaching up with my small knife in the other hand and cutting the heart and lungs free. As you pull the heart and lungs back, you will need to finish cutting the diaphragm loose and other attachments on the spine side as you pull the intestines out. Here is a good time to free the "vent" if you haven't done it. With practice, you will learn the amount of force it takes to pull the rectum through the pelvis so you will know if you need to do more cutting to allow it to pull free.
Gosh, a lot of typing. Hope I answered the question.