I use 150 to 155 degrees for scalding. Tom

I am not sure about what age the birds would be to yeild a two and half pound roaster. I am sure that some of the hatcheries would be able to answer your question. If nothing else you could geustimate based off of live weight.

To me, if you like the Cornish Game Hens on a regular basis, it would make sense to just order extras to try to butcher enough of them that you have a supply of them in the freezer, while the rest of them are growing up to fryer size.
Kevin

I agree with Kevin. Try a few at 3 weeks to see if they're the size that you're looking for. If not, keep trying every few days until you get what you want.

You should know that the term Cornish Game "Hen", although derived from one of the breed names used originally to create the terminal cross, is merely an industry marketing term. The actual bird that you receive, and eat, can be either sex, and they are no longer simple Cornish crosses. They are now industrial hybrids, with very little pure Cornish blood, certainly nowhere near 50%.