Why list COAL?

[darkker]

I said to a point, not to compression, can't remember enough of the work to know if he did compression tests as well.
Dr. Lloyd Brownell wrote a book called "Firearms Pressure Factors", in the 60's. Wolff publishing still sells it. Hartmut acknowledges this in QL with his start pressure Kludge. Hornady manuals discuss this, as well.

UncleNick has link to a chart based on Brownell's work, you can see it here:
http://imagizer.imageshack.us/a/img8...hvpressure.gif

It is worth mentioning this is only true in rifles. Pistols behave backwards. Seating deeper raises Pressure.