LF Cornish, for their massive body, only lay medium sized eggs. I think it is a bit amusing that they start out so small too, almost bantam small, but then grow into these massive, bulky birds. I was just putting topical and leg bands on the Cornish last night and it always amazes me to feel and see what they have grown into.Blackbriars, that sounds like a good start. Ten grams more than what my dark cornish hens started laying. The egg size got bigger in a hurry. I'm still not sure which of my eggs are from my Buckeyes! Only four of my pullets are Buckeyes.