turkey 2 hours at 260 C/500 F/
http://www.food.com/recipe/safeways-two-hour-turkey-337236
I've tried both high and low temperature roasting for turkey, and for me low temperature wins in every way except time taken.
But high temperature to me is 200C, not 250 :o In fact I'm not sure our oven would cope with 250C! I can only imagine that a bird cooked like that would be exceedingly tough.
'Fraid I wouldn't want to risk it, certainly not for Christmas lunch. 190c in a fan oven is as high as I go. Have you tried it PL?
my mum did 2 year ago it came out great