Well if factory ELDX shot accurately, measure ELDX box ammo from the ogive and get the average so at least you can start with bullet seating depth in a good place.
Then start like everybody else does with load development in .2 increments of H4350. Because the chances of anyone else load data matching your Barrel exactly the same is slim to none. You could also start by letting people know what bolt you're running, if you're not running a HP bolt then loads are going to start lower anyway.