Last year I tried on two ckrls that were ~9mo old. We knew they were too old but they were being butchered anyway so that was the initial foray. I learned a lot from that experience and knew heeding the advice of experience from here that the younger birds are the way to go. I purposefully waited till 5 weeks. This seemed to be a common denominator in the reading I had done. I like what we found. The birds were big enough yet the testes were still nice and firm. We had no trouble locating the testes in the body cavity. They are a nice light yellow in contrast to everything around them. I have the "chinese" tools that are talked about earlier in this thread and they worked well.
Thanks BCM and Kass as it was you guys and all the others that have put down a nice clear path for us to follow. The guy I raise chickens with came over with two of his sons and we all learned a lot. He will be receiving 300 CX in about a month and he says I can have all the capon practice I could want
. Wishing everyone a Merry Christmas..