As I understand it right now a ladder test will help me time the bullet to muzzle at a node of flex in the harmonic sine wave of the barrel.. Now assuming I have done that with the method in the precision instructions in the sticky set above.. I learned my node point with oal set to max.. Now if I make any changes to the load will my objective be to match that muzzle velocity I learned to be right.. Or when any variable in the cartridge is changed I will have to complete test again?..