Yeah, it was hamburger instead of a roast (which I normally do)
I tell you what. After learning about the the Cook's Illustrated baking soda treatment for ground beef, it's become very difficult to justify the extra work to dice up a chuck roast for chili (except, perhaps, for very special occasions). The ground beef just comes out so good, as long as you don't break it up too much while browning.
I try to keep the ground beef chunks around 1/4-1/2 inch, although some extra big chunks (maybe a full inch) and some "dust" doesn't hurt.