They are not meant to expand. I do however find the 124 gr to be more accurate and consistent than their RN counterpart. Not so much with the 115's, and I just got my first box from Wes last week of the 147's. Can't wait to try them out suppressed in my Scorpion. The 115's shot ok for me, just not the noticeable difference in accuracy between the HP and the RN. Good luck with them, they are fine plinking/target bullets.