Originally Posted by ziarifleman
76.8 is supposed to be max according to Sierra, but they did their development in a Savage, and both my Lyman and Hornady manuals list significantly heavier charges.
There are those who will get their shorts in a knot over what I am going to tell you, but this is the technique I have used for many years in developing MAX loads.
I use a 1.0" micrometer capable of measuring to .0001" accurately - with an emphasis on accurately.
Noting the local temperature (matching that to those encountered during hunting conditions) I increase the powder charge until I measure 0.001" case head expansion. At that point I declare that to be the MAX load for that rifle/reload combo. I then reduce the powder charge 1.0grs and use that as my hunting load. Case life is not long when you use this approach, I have had limited success in extending case life by annealing the brass.
I will give you a far warning - this practice is largely opposed by many "Average Joe" reloaders.
I guess what I am trying to say here is, closely monitor the case head expansion of your brass as you approach the powders charges listed in the "other reloading manuals."