If the 125gr JHP from Zero bullet is anything like that from Montana Gold they do not expand. I tested some Montana Gold 124g HP's a few years ago into some wet sand bags and none of the 15 rounds expanded. The jackets came off and the lead core had little to no deformation.
124g XTP's on the same sand bags opened up nicely as did 147g Gold Dots.
I don't recall the powder charge used but, I know it was published data and not hot loads for all the above loads.
NRA Life Member, SAF Member
Last edited by Xfire68; January 5, 2013 at 12:12 PM.