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M$1 Answer
The temperature should measure 165 degrees Farenheit or higher in each part of the turkey. With this method,the turkey is cooked at a very high 500-450 degrees farenheit.
http://urbanext.illinois.edu/turkey/turkey_faqs.cfm
http://urbanext.illinois.edu/turkey/turkey_faqs.cfm
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M$
Your sorce is referring to a "high temperature roasting method" and recommend it only for 8-12 pound birds. Recommended temperatures for cooking is almost universally 325. I have cooked 10 Turkeys at 325. they all would have been burned on the outside and raw on the inside at 500.
http://www.butterball.com/tips-how-tos/how-tos/cook-in-a-convection-oven