ME TOO!!!!I don't know for sure about the California grays, but you might want to check and see if the roos are double barred. If so they would pass the barring to 100% of the chicks. The California whites are a cross and I think the roos only have 1 copy of the barring gene so they will not breed true, but I don't care I want barred EE LOL.
Here's what Ideal's website says about them:
"Production Blacks were developed by Ideal Poultry in the early 1960's. They are a combination of several breeds but are basically a black, silver barred plumage bird, which has a plumage color pattern similar to Barred Plymouth Rocks. This breed is the most efficient white egg producer of the breeds and varieties that are not primarily white. They breed true; however, they have not been recognized as a pure breed by the American Standard of Perfection."
and the pic from their site:

