Spokecalc gave me 292.1

Butted spokes will stretch more then unbutted.........

The really thin 15/17 gauge Revolutions will stretch more then 14g strait spokes.

How much is too much?

I don't want to buy a box of 72 to find out I bought wrong. I can't find any spoke suppliers that will sell under a box on the 1.8/1.5's