I got a response from MRC already. They say to try a different brand of factory ammo. They said: "try another brand of out of the box factory ammo. No re-loads since we don’t support these types of issues under warranty if re-loads are being used."
At least they got back to me unlike Hornady. I don't really want to buy more factory ammo, but maybe I will to see if get more misfires. 18 out of 20 Hornady ammo worked fine and 19 out of 20 of my reloads worked fine and 12 of 12 factory winchester ammo worked.
