Rossimp,
As much as I respect Wooters work and have enjoyed his writing, looking at primers and brass is not an accurate means of determining pressure. Other means are now available to writers which are accepted as reasonably accurate. IIRC, Linebaugh's penetration tests were conducted in wet newspaper which is a questionable test medium.
416 Rem Mag runs 62k psi to make 2400fps, 12% less case capacity of the Taylor can't be good.
