11 to 11.5 depending on the socks I'm wearing. I've never tried on any Barrie last boots.
Also, what's your opinion on using the arch length? I understand that it's more important than heel-toe. However, the Brannock device's arch slider can easily vary +/- one size in wiggle room. In any case, my arch length and heel-toe length seem close enough, as far as I can tell with the wiggle room and all.
Thanks for your help!