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Ron, I got the 10% figure from the section on this site that is called How to Create the Ultimate Dry Aged Beef. Step 4c says “During this time, expect the beef to lose about 10% in weight.” Here the reference is for 7-21 days. My actual weight loss is pretty close to the 21% you refer to. My problem is that I lost a total of about 60% total combining shrinkage and trimming (out of a 9 lb dried weight whole ribeye I got 4 pounds 10 ounces of steak and 4 pounds 6 ounces of trimmings – mainly a very huge fat cap. And, to add insult to injury the steaks that I do have are about 35% fat due to a large fat streak that runs through the entire piece of meat. I figure I ended up with maybe 3 pounds of meat for $130. Never again will I do prime when I had such a fine product using choice! I am taking the this to the store I got it from (I live 60 miles away in the country) and hope they will do right by me. Their steaks in the counter looked nothing like what I ended up with as far as fat content!