"... pressures of 60K to 64K psi for the hot Swifts and .223s...what does that equate to in cup?"
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<br>Only very, VERY approximately, about 50,000 to 55,000 c u p -- lb/sq in. is a precise unit; c u p is a VERY loose approximation without any firm foundation. So there's no way to equate either unit to the other with any hope of precision.
