With the bayou 105 grain tc bullet over 3.5 grains titegroup accurate and shoots with stock springs out of my xdm 5.25, sig p210 , eaa witness and sig p210. Can't recall but power factor is under 120. I just haven't got around to sport pistol with that bullet. But with 3.5 grains sp and bayou 135 grain accuracy is good and mild load that makes power factor. But I don't think there's a power factor for steel. Sent from my SM-G960U using Tapatalk