It seemed to me that the 124gr shot slightly softer but not noticeably. I was mainly trying to compromise between the the 115 and 147. A lot of R9ers like the 147 but I just haven't tried it, probably because I had a cracked slide, not shooting the 147gr, and am very sensitive to the possibility of putting additional stress on the pup. My R9 has worked flawlessly since the slide was replaced and the upgrade of other internals like the extractor, ejector, etc., or whatever else they did to it. There is something to be said for using similar ammo weights between different pistols.