There is a guy who is selling freedom ranger hatching eggs over in the eggs for sale forum (he has original FRs from JM). I believe he's said that the second-generation has more variability in size, but that they're still meaties.
Here's one of his auctions:
https://www.backyardchickens.com/forum/viewtopic.php?id=318034
Here's one of his auctions:
https://www.backyardchickens.com/forum/viewtopic.php?id=318034