We had been running 124gr Bayou Bullets with TiteGroup, but after a little tinkering, we've swapped it up some. Now, we use the following...
155gr Swamp Popper coated RN (local bullet maker)
3.0gr Sport Pistol
Fiocchi small pistol primer
1.125 OAL
Works in my wife's XDMs (5.25 main gun and OSP 4.5 backup) and my "old as dirt" SP01, as well as my TriStar P120. Recoil is so light it's almost comical. Makes 131pf in the SP01 and the 4.5 XDM.