Have you guys seen this data?
Uh, I just looked at the data you reference. I consider it way over maximum and the man's loading practices ill-conceived. I advise everyone reading this to steer very clear of thhis data.
Here is a note that appears next to one of the loads on the site:
"near top load
significant case head expansion (.511/.531) but no ejector slot imprint yet"
From this note it is obvious that this man has no clue of the definition of "case head expansion." The 0.020" of expansion he experienced is probably measured on the pressure ring of the case body, not the head. True case head expansion of 0.020" would indicate astronomical pressure. According to the Speer reloading manual #13, actual case head expansion of 0.0003" to 0.0005" in once-fired cases indicates pressure in the neighborhood of 60,000 PSI. Yes, my decimal places are in the correct positions.
And then we have the statement, "but no ejector slot imprint yet." An imprint of the ejector slot in the headstamp of a case indicates the brass is flowing back into the slot due to astronomical pressure. If the man typically adds powder to his loads until he sees this imprint, he is flirting with disaster - even death. Just because it is easy for handloaders to overload their ammo does not make it wise.
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