I'm cooking a 12.4lb turkey not stuffed. How long should I bake it and what temp.? Thank you

Try the Barbara Kafka high-heat method found here: https://food52.com/recipes/38997-barbara-kafka-s-simple-roast-turkey
She says that a 12 pound bird will take about 1 hour and 50 minutes: http://www.bkafka.com/Recipes/roastturkey.html

Here's a helpful guide! https://food52.com/blog/11646-the-essential-numbers-a-guide-to-times-and-temps-for-cooking-your-bird