Unfortunately no Dan. The shooter apparently did not have his reloads tested.
We do know that independent testing of those Cheddite for Herters 16g Select Field Dove and Quail 1 oz. at 1165 fps showed pressure averaging 12,500 psi, with one at 13,400 psi. Raise the pressure with the short chamber and we are approaching proof load pressures. WOW.
CIP standard for both 65 and 70 mm 16g is SERVICE 780 BAR or 11,313 psi; PROOF 980 BAR or 14,214 psi.