This is my second batch. I have yet to actually hatch a single chick successfully. The first batch was what I considered to be a practice batch with a very janky makeshift incubator consisting of a brooder plate and a plastic box with a sponge in it. I'm not really very surprised none of them hatched.
This second failed hatch used a harris farms incubator. 16 eggs I bought and had shipped, and 6 from my own hen. Only two from my hen were developing at all, the purchased eggs were all duds. The current theory is they were x-rayed somewhere along the line by the post office.
The next batch in the brooder is another breed (Red Dorkings) I purchased and I drove 3.5 hours each way to pick them up personally just so I could be absolutely sure x-rays could not be at fault if this batch doesn't hatch at all.
I'm relatively certain I'm doing everything right, but it is pretty frustrating to have a 0% hatch rate twice in a row.
I have a broody hen that is sitting on a batch that I hope will have better luck.