Quote: "20.83# (assumes boneless to begin with)
200 oz = 12.5 #
Assuming shrinkage of around 3/5, you get 20.83# to start with"
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There is a slight error here. If shrinkage is 3/5 (60%) then you need 31.25 lbs to begin with.
If shrinkage is 2/5 (40%) then 20.83 lbs would be correct.