IMO, if you hold over a few of your Rangers or Pioneers, and breed them back to each other, you've got nothing to loose in trying to develop your own line of meaties. Sure, these birds are hybrids. But, the gene pool is there for a nice meaty bird. So, I'd start there. In fact, I already have, by holding back one of my Pioneer pullets. She was the smallest of the 9 I raised, which from a breeding stand point, that was a really stupid decision on my part. On the other hand, she's a nice gal, bigger than the rest of my hens, and she's a very good layer. I hope she'll bring some size into my flock.