i'm sitting here looking at my soda cans, and thinking that sounds about right to me??
my bantam cochins are a little larger than a dove, but smaller than a pidgeon,that would be the size for the silky too, and my large fowl EE's are bigger than my leghorn, i would give the EE's 3 soda cans, and the leghorn slightly less... and i have what i think is a RIR or RIR mix, and she's the same size as the leghorn...
i do have 3 barred rocks that didn't get very big, but i also stopped feeding them the medicated chick food about a month early ... we were switching the rest of the flock and at the time just couldn't buy 2 different kinds of feed.... i'm worried that i stunted their growth.. lol... oh well.. they will eventually lay eggs which is their only worry anyway...
i see photos of other BYC'ers with their birds, and the birds look HUGE... like take up an entire adult lap... i'm guessing that a lot of these birds are breeder birds, not hatchery birds like mine.... where did you get your birds??
i might be able to get them to stand next to soda cans tomorrow or monday if you need pictures... lol...
i don't know... maybe we're both growing runts??
*edit*
i forgot i had uploaded this pic here, it shows my RIR next to my banties... does that look about like your size ratio??