i wear a size 10 shoe. i have size 44 alpinestar smx4's, and there's quite a bit of slope in them. would preferred 43's, but with my fatter ankles i couldn't zip'm. prob don't help ya none, but at least something.
on the flip side.....I wear a 10.5 Nike running shoe and both of my A* boots (SMX-Plus and Supertech R) are size 43.