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I have been and still am very dubious that Burrard's conversion has any meaningful application to period American shotgun lead crusher pressure numbers.
Consider this on the DuPont Lab data cited by Askins and shown in my cell phone inset:
4.70 tons/sq inch X 2240 long ton pounds X 1.10 rough conversion from lead crusher tons to transducer psi = ~ 11,580 psi which is on par with industry standard average max pressure for 2-3/4" 12-gauge.
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