At 6 months a heritage turkey has not even finished growing it's frame, or started to put on much weight, so it would make a very skinny processed bird! They do not usually reach max processing weight until they are near 18 months. At 18 months, you can estimate the process weight to be 20% less than live weight. At 6 months, they probably won't reach 40% of their live weight, after processing. Hatcheries put live weight averages in their catalogs, for each breed and I know I listed most of the APA recognized breeds on some of the turkey threads in which this question was asked. Keep in mind that individuals can differ from each other as well as different breeds can differ. The largest Heritage breeds are Standard Bronze and Holland White, the Smallest are Midget Whites and Beltsville Small Whites, all the others fall in between, with an average weight of approx. 33 # for toms and 25# for hens at 18 months and that is live weight.