I have about 250 each RMR 9mm 124 Gr .JHP bullets and I want to load some 9mm with them. I have looked in my Speer #14 book and it shows 124 gr GDHP using Unique powder, I also looked in my Lyman 50th and it shows 124 Gr. JHP using Unique powder & my Hodgdon 2022 shows 125 Gr. Sei (Sierra) JHP. Can I use any of these loads and why do they all have different Coals?. Speer shows a coal of 1.120, Lyman shows a coal of 1.075 and Hodgdon shows a coal of 1.090?????? Now you can see why I am confused!! Does it matter who makes the bullet as long as it is a Hollow Point bullet with the same grain weight? Would one grain weight, like 124 gr &125 gr make that much difference?? Thanks for unconfusing me.
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