Better to use a convection oven or regular oven for the Judy Bird turkey? If convection, different cooking time and temperature?

My oven instructions say to reduce the temperature by 25 degrees when on "pure convection," and cooking times should be the same. Check your manual (and if you don't have it handy, look online for it. Most manufacturers have all manuals in PDF. You may need your model number; that should be visible when you open the oven door (look on the edge of the door or on the trim right above the door, on the inside). Those instructions may also give you advice on which setting to use. "Convection roast" is recommended on my oven for large roasts of any kind. ;o)

If using a convection oven, most sources say to use the same cooking temp, but reduce cooking time by around twenty five percent!