I have to disagree- definitely do not 1/2 size down in the LB unless you want your toes to touch the end of the boots.
I must share that I have a perfect fit in 11 1/2 D 5 last shoes(PA, Strand, Bleecker St.) as well as 108 last and 333 last shoes( Mora, University). In the Daltons and the Long Branch, I have to have a 12D. The 511 last runs SHORT compared to the others. The Long Branch has a little wider fit due to being actually made on the 511G last. I got fooled into getting an 11 1/2 in the Long Branch by just such comments as the "roominess " of the Long Branch, and I wore it 3 or 4 times ultimately realizing the discomfort was due to them being too small. I bought a 12D Long Branch and have been much more comfortable and happy!
So do the Dalton and the Long Branch fit differently?