Thanks Mike, I believe the equivalent of HPH12 thickness is what I have a few bags of in the garage. Older MMP stuff but I may want to shoot it some of these days. Have a nearly full box of 300 grain XTPs that I might as well do something about. The .40 Shockwaves in the blue MMPs went down smoothlyrequiring enough pressure to know you were definitely pushing something but not so much as to be a PIA.

edit: just put the mic' to one of the Shockwaves and one of the .452 300 gn XTPs inside the sabots I have (older, standard black MMPs). Tried to center on the bullet/petals and put just a bit of pressure on the plastic with the mic'. .505 for the Shockwaves and .510 for the XTP combo. Drat! Don't think I'll even mess with those XTPs - no wonder I didn't like those things.