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Have you seen how big Greenfire Sussex are in person? They would probably think little bantam Orps are just little bugs and try to eat them, lol. And the poor little Orp hens would be smashed if a Big Sussex roo did try to breed her. Speckled Sussex are smaller and easier to get than Buff Sussex, and Speckeld Sussex are Red Columbian, so by the time you keep breeding back to the Buff Orps for smaller size, you should have picked up the Columbian base from the Sussex and diluted it to Buff Columbian by then.
I have successfully mated LF roos to tiny bantam hens (some roos were 3 to 4 times the size of the bantam hens and they did just fine.) I had not thought of using a Speckled Sussex instead but that may work better. Now that you mention it I think Hinkjc crossed SS to BO and got birds that looked to be on their way to a buff columbian. I love this forum so many good ideas.
Yep, hinkic used a SS roo on LF BO hens and the F1s looked kinda like NHReds, Which I believe is a Columbian based color as well.