http://www.smithfast.com/msflathead.html. For both 82º and 100º screws it lists all the relevant dimensions of the countersunk head. It lists 82º #10 screws as between .098 and .116. 100º is even smaller, so you should be good (although just barely).
I really like finding websites like that that give every imaginable chain, fastener, or whatever dimensions you would ever need.