I've been doing quite a bit of 9mm load development lately and the two bullets that work best in my guns are the hornady hap 125gr and montana gold jhp 124gr. I can use them pretty much interchangeably, same charge, same oal, same velocity, even the same seating die setup. Even the accuracy seems to be the same, or at least to the limits of me and my equipment. Has anybody else found out they can use these two bullets interchangeably with similar results/findings?