About $0.26 per round. Your major cost is the bullet, I use the expensive ones. With cheap bullets, you can keep it under $0.20 to $0.18 a round using used brass.
That's pretty much my experience as well. My last batch of 1,000 rounds was done at about .19 per round using the cheap Armscor bullets. Can't put a dollar figure on the time it took me to do this, but it's a lot of fun to me so I don't count it as work.