Yellow T/C sabot is the SuperGlide. I have no hard data for loaded OD
MMP HPH-24 is around .503-.504 loaded OD so i dont see how it would be larger if yours already measure .504.
HPH-12 on the other hand is larger and did ship with some T/C bullets.

This is how to tell the difference between HPH 12 and 24....The base is stepped differently and the number looks different. Its stamped into the mold vs looking etched/engraved. HPH-24 is on the right even though its blue.
http://www.barnesbullets.com/news/mu...ps-and-tricks/