1/3 stop increments vs 1/2 stop maybe?
I would say so. 1/180th is a standard 1/2 stop shutter speed. Just like you (the OP, that is) would have 1/350th and 1/500 with no 1/400 in between.
You're not Honey's dad are you?
Isn't that Sugar bear or some other such nonsense.