Curious here, is there anyway to calculate a zero with a ballistics app from load A to load B? Or do you just have to re-shoot and zero it again each time you switch ammo? Ex: If I go from shooting Federal 160 gr nosler partitions @2950 and a BC of .475 from my 7mm, to shooting cheaper Federal 150 gr soft points @3150 and .359 BC while with friends. Is there any way to know what my moa shift should be from one to another? And to use that offset when dialing in a solution to hit some 300 yard gongs for just fun? Or do I just have to leave my sight on my preferred as a zero, take some test shots, and record what the difference is and remember/make a note of that?