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Cool, thank you. That's what I was thinking was probably correct, but wanted to check before I speak to my spoke guy! He can do odd numbered cx ray, but I expect it'll cost more as he has to cut them - will evens be ok? i.e. 256, 252, 266 and 266? And finally - brass nipples over alu, and 12mm?
dglshrn-
I've only ever used evens lengths. 1mm really isn't going to make any difference - as long as the spoke isn't 1mm too long.
I'll probably get cast out as a heretic for saying this, but I much prefer good ali nipples to brass ones. I've never had any problems with Sapim Polyax alloy nipples (apart from one which broke after having been marinaded in latex/ammonia sealant for several years), and I've had quite a few problems with brass nipples binding, breaking and releasing suddenly for no reason. My default choice is 14mm Polyax alloy nipples.
Brommers
Use the figure as measured, then round down on the spoke lengths. LB seem to measure just to the inside of the rim, without allowing for the part of the spoke which should be inside the head of the nipple, so assuming you want the spoke to be roughly flush with the top of the nipple you would expect to add a few mm's to their measurement to get the true ERD.