Is the crusher we are referring to here either a lead or copper pellet, or is only one of these used to measure shotgun pressures? Are L.U.P. and C.U.P. measurements of the same level, say for example 7500, equal in piezoelectric or p.s.i. readings, or is there a differece between those two units of pressure measurement? I guess what I'm getting at is when folks here say that a 7000 psi load is safe in a certain Damascus barrel, is this copper crusher, lead crusher, p.s.i., or what?

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