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I don’t know how others using the other method can avoid having spokes which are too long
By allowing for strain at some other point in the calculation. ERD is, for my money, properly defined as the diameter to the spoke ends at full tension. Where you want the spoke ends to be depends on the nipple geometry, and where they end up depends on the strain, so somewhere along the line you need to account for those things, whether by rule of thumb or rigorous calculation.
gbj_tester
probably down to how the ERD is measured… some include the all length of a 12 mm nipple, some only include a 10 mm portion of it. I belong to the latter camp, so my measured ERD could be up to 4 mm shorter than others. Thing is, using my method I already tend to get spoke which use all the thread available, so I don’t know how others using the other method can avoid having spokes which are too long