My son bought a 9MM and a neighbor I did a favor for gave me about 1500 once fired empties for payment. My son couldn't find any 9MM around so we loaded up some,115Gr RN, 124 Gr RN, 124 Gr HP, 147 Gr RN. My question is why are the such a difference in load data? Alliant say's the max load, using Unique is 4.3 Gr for a 147 Gr RN. Nosler say's using Unique the Max is 3.6 Gr, Mid is 3.3 Gr, and start is 2.6 Gr's, Speer manual #14 says using Unique, start is 3.8Gr to start and Max is 4.3 Gr. WHY IS THERE SUCH A DIFFERENCE IN LOAD DATA, MAKES IT CONFUSING. I know the bullet style doesn't matter but why the big difference in load data?? Thanks to who ever knows the answer to this confusing question.