Indeed a happy, fortunate coincidence! I once had a pre-64 Win. M70 Featherweight in .308 that would put my "service" load consisting of 51.5 grains of H380 with the 165 grain Nosler Partition (MV 2800 FPS) and my cast plinking/practice load using the Lyman .31141HP @ 1800 FPS into the same group @ 100 yards. I thought this was also pretty fortunate and unusual! Never had to rezero when switching from one load to the other.