Fifty years ago,I was given a knife by my father-in-law called a Khyber duel blade locking folder. I can't count the number of game animals it's cleaned,but,it doesn't know "quit". I have no idea what kind of steel the blades are,but,they hold an edge like crazy and sharpen to a razor edge quickly. I also use a wide bladed Rapala Skinner with a gut zipper tip that opens carcasses up in seconds.