I did, though it wasn't specifically for breeding - I also free range and was trying to manage heat. CX take forever before they hit their reproductive prime. OK< not as bad as my dark brahma, but colse to the 7 month mark - and my Roos still couldn't successfully do the deed.
I did have one pullet I used in my
culling project successfully. Offspring from that pairing were all healthy, I was 50/50 for the "size" gene (that is, offspring who grew substantially faster than their siblings, though nothing like a good CX line fed ad libitum), and they were all dominate white birds with leakage.
That breeder has now been culled - she was suffering hard molt and out heat (which has only climbed since, it was the right call to make) at around 10.1x pounds, 14 months of age [if I recall correctly]. We used her for breakfast sausage. Her insides appeared healthy, and there was a decent amount of bright yellow subcutaneous fat, in spite of a once daily feeding and free ranging subsistance the rest of the time.
Hope that helps.