Re: Adjustments to load after adding muzzle brake
A muzzle break is an added mass on the end of the barrel, so it will change the vibrational properties of the barrel for sure. Whether that has any substantial impact depends on whether it causes a shift in the timing of the shock wave that travels through the barrel at the point the bullet is leaving the muzzle and you probably have a 50/50 chance that it will.
If the POI shifts, all you should have to do is find your new powder charge accuracy node which may be higher or lower than it was before. There should be no reason to change your seating depth since the MB does not change the throat...