We have raised our first turkeys this year, a couple of BBB toms. My question is what is the percentage for carcass weight that we should expect? When I weighed the boys just over a week ago they were 54 and 57 lbs. I know they will be the hugest ones we've ever roasted, but am not sure how much loss to expect after they're butchered. Also, any tips on cooking time and temperature for such an enormous bird?