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A bird of that size should be spatchcock (cut and layed flat) then you can smoke it at about 275 for about 30 minutes a pound and you should be fine. I have never smoked a bird that way so if I'm wrong. I'm sorry but there should be someone come thue soon enough to gve you the right times
I'm smoking a 20#er and put it on at 5:00 was at 37* just took a reading now at 6:30 at 94*. Im using a UDS with Kingsford charcoal, dont use that cheap stuff, it dont work well.