the second video (for 147 standard) is from tnoutdoors9 (hope i spelled the name right.)
he also tested the +p. i think his meathods are pretty sound. i also think he may be a forum member.
i am pretty sure the reason the +p got 14" in the clear gel but only 11" in calibrated ballistics gel......... was the clear gel. just saying.
with greater expansion comes less penetration.