Hi Keith, don't underestimate the importance of intonation on a Bass as a lot of people think it only matters higher up but if the string length is wrong to begin with the out of tune phenomena kicks in much sooner and quite often before reaching the 12th fret.

Best thing is as Simon said and to have at least 5mm thread in front of the G string saddle where it should then measure 34" from the inner side of the nut.

Cheers, Waz