Just bought some powder skis and would like to set them up so both my son and I can use them. To do this we need to have a BSL adjustment range of 326 to 349, Hoping to do this without a demo binding. Can this be done?
Welcome to Epic. Salomon/Atomic STH2 probably has the greatest amount of adjustment outside demo bindings, but I don't recall if its over 2cm. Your best bet really is a demo binding and the AAAtack 13 demo is the best I've seen. There is no connecting plate between the toe and heel.
Most bindings seem to be +/- a cm. Even with a bigger range, one of you will end up a bit forward or back. Maybe not a big deal if you mount to split the difference?
One alternative might be the original Tyrolia Attack 13 "demo". IIRC that one had just a really long rear track with a non-demo toe. Last I looked, untracked.com still had some at a good price. Of course there is always the option of the newer Attack (separate heel/toe adjustment) or Griffon demos...
FWIW,IMO the Attacks make for a great powder binding as they are low, flat, and really easy to click into.
edit: I believe this is the one... http://www.untracked.com/p5216c26b52-14_tyrolia_attack_130lt_demo_ski_bindings.html
STH2 13WTR has a 28mm range, which would work for you IF they are mounted properly by a tech who will pay attention and not mount in the center of the range for one of you. The STH 12 goes 19mm--too little range for you. I believe the FKS/Look pivot series has less range than a lot of other bindings.