After you reload for some time you will come to the realization that it is NOT an exact science and therefore different manuals will have different reloading data. Each person that did the same science experiment in High School came out with different yields.....remember?

The slight variations are due to:

* different powder manufacture dates, brands of primers and brands of bullets
* how tight or severe your crimp is
* how many times your cases have been loaded
* individual press set ups and idiosyncrasies
* different bullet lubes
* how conservative or brave the reloading manual publisher wants to be
* etc etc.

Chief38