What a humbling experience! I've built 100's of wheels before but I've got to be doing something goofy and I can't figure out what it is.

Chris King Classic front hub, Mavic Open pro rim, 32 holes, cross 3. Depending on which spoke calculator I use I get answers from 295 to 277mm. I'm using 295mm spokes which I realize is on the short end of the range, but they look to be around 3 or 4mm short.

I'm tempted to just buy some 298mm spokes but I'm kind of reluctant to do that until I figure out what I'm doing wrong. Anybody have an idea?