Maybe I can shed some light on your question. I wear a Brannock 10 1/2D. Also wear 10 1/2D in both the shell and suede Aberdeen Tassel. Obviously, I take a 10 D in Barrie. I've found there is no difference sizewise between Aberdeen lasts. They run closest to Brannock sizes of all the shoes I've worn. Hope this helps. I haven't tried a C width in Barrie as they are rather hard to come by.