I have a question about inconsistencies between manuals. I have some 40 S&W 165gr Montana Gold JHP bullets with HS-6 powder. I've got several manuals, and this is what I see:
Lee book - COAL=1.125", 7.3gr - 8gr
Speer book - COAL=1.120", 8gr - 8.5 gr (huh?!)
Sierra book - COAL=1.125", 6.4gr - 7.9gr
Hodgon book - COAL=1.125", 7.3gr - 8gr
How the heck do I decide with such a wide difference between powder manufacturers? Do I just go with the Hodgdon data since it's their powder I'm using? What the heck is up with the Speer data? More powder in a smaller space? In fact, their starting data is what most other powders call the max! I was thinking of just going with the Hodgdon data, but thought I would throw this out there.
Thanks for sharing your knowledge and experience!
Mike