For most modern arms with smokeless rifle calibers the pressure signs like sticky extraction or extractor marks begins high in the red area above 60.000 p.s.i.'s. The magenta or "purple" area marks the border range for full work loads just below Maximum Average Pressure (MAP)
"A stupid man's report of what a clever man says can never be accurate, because he unconsciously translates what he hears into something he can understand." Bertrand Russell
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