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According to USDA, ribs are done when they are 145Â°F internal temp, but they may still be tough. If you take them up to 180Â°F, drop the oven temp to about 180Â°F and hold them at this temp for about 30 minutes, the collagens and fats melt some more at this temp and make the meat more tender and juicy.eat can cause this shrinkage. Put ribs on a hot grill and they will shrink within an hour, but they won't be done. On the other hand, if you keep the temp under 250Â°F, by the time the meat pulls back, it is overcooked. The peek-a-boo test.
Cook the prime rib roast for 13 to 15 minutes per pound. Insert a meat thermometer into the roast to check for doneness. A rare roast is ready when the temperature is 130 degrees Fahrenheit, a medium roast will read 140 and a well-done prime rib will read 150 on the thermometer.nsert a meat thermometer into the roast to check for doneness. A rare roast is ready when the temperature is 130 degrees Fahrenheit, a medium roast will read 140 and a well-done prime rib will read 150 on the thermometer.