I recently made my first batch of 9mm Luger. I used the Modern Reloading 2nd Edition from Lee to obtain my data/recipes. I chose Unique powder as it seemed to be useful in a few of the different bullet weights that I wanted to try. I also chose to use 124 grain Hornady XTPs as my projectile. Using the Lee book, for 124 grain XTPs and Unique powder, I should have a starting powder charge of 5.1 grains and a DO NOT EXCEED of 5.8 grains. Today at while killing time a local sporting goods store, I decided to see what the Hornady book said for powders charges. I was shocked and a little bit scared to see that they said (again with 124 grain XTPs and Unique powder) that the starting charge was 4.0 grains and a DO NOT EXCEED of 5.0 grains. This made me more than a little nervous and immediately contemplated the purchase of a bullet puller! To me, thats a pretty big difference, in a small cartridge like the 9mm luger. So why the big difference in the charge weights? How does that effect my safety and the well being of favorite pistol?