Lildinkem,
these brown cross breed roos of yours look great. Years ago when I bred Modena pigeons, we had planned breedings of red to black to enrich the black. When we took black to black too many times, the black primary feathers in the wings would start to get "washed out" with white. Red to red was not good either, nor was yellow to yellow. We often took yellow to red and vica versa, some of those breedings created sex linked offspring. I think you are on to something here especially with body type and strengthening the beetle green sheen. If you can keep a tighter feather within your offspring with the body type you are showing here, I think that would make a great looking bird.
Dan the way I learn is trial and error. IF I see something that works I keep on doing it. I was very pleased with my F-2's from using the original male I kept from the Buff to Black Aussie mix. He in fact was a Silver with Dun leakage. As a by product I have the Dun gene. Another trait hidden in that "Hatchery" mix was BANTAM. lolol Last year out of my #2 Black Orp pen that had the Black Orp hen, I hatched out a Dun bantam. The previous year I hatched out from her sister when taken to my Cuckoo Orp I hatched out a pair Rosecomb Cuckoo bantams. I could not give them away. I am not into breeding these totally non standard breeds. IF you go onto the UK Orp thread you will see a whole slew of non standard Orp varieties that people are buying to sell and enjoy. For now I am just into making standard breed varieties. A few of our APA breeders like the choice of using the new line of UK Orps to better the type of our BBS varieties. They want to make em more competative with our APA Buff Orps. I figure I already have the Buff type built into some of my Blacks, why not use em. As you said, and I agree, I like the type of these 2 Brown/Reds.
Geoff, from my test breeding I have not had any purple sheen Blacks. Don't mean I will not in the future. I have had no lack of green in my existing line of pure Blacks. I just noticed how much more green and more vivid green sheen I have with this line that has the Buff bred into them.
Here is a pic of one of Harold's sons. He had about a half dozen red feathers on each wing about 4 months ago. For some reason he has lost them. I had not removed them. MAYBE he or some of the girls in with him have. He still has the one red hackle feather left.
He is the pen with my original daughter from the Silver Dun cock. That original cock was 11 lbs at 11 months old. And here in the US APA shows size matters.