This is for a 9, right?
pcwirepro, you asked about Power Factor....
Power Factor (PF) is a term used in the IPSC-USPSA games (IDPA too?) to express the [mass x velocity] of the ammo used in competition. For example, the ammo that IPSC Production division shooters use must, according to the rules, meet a minimum power factor (PF) of 125.
The thinking behind this is that it is felt that the lower power rounds are easier to shoot, so the rules keep folk from loading true puff loads (like your unintended 3.1gr of 700-X). (no offence intended)
To determine your load's PF, a small sample is shot in your gun over a chronometer. The average velocity is multiplied by your declared bullet weight. The end result is divided by 1000. (short explanation)
So then, a 124gr bullet at 1015fps will make a PF of 125.8, which barely meets the minimum PF ceiling of 125.0. However the match officials may not accept your declared bullet weight, and so they will pull and weigh one of your bullets. Say it turns out those Berry's actually weigh 123gr (not unusual), then your ammo's PF is 123gr x 1015fps/1000 = PF of 124.8 Since this does not meet min. PF, you would shoot the match for no score.
Most folk load their 9mm to a PF of 130 to 135, to account for bullet weight variability, changes in altitude, humidity, air temperature, etc.
I have experimented with load levels, and found that my handgun recovers from recoil more quickly at a PF of 130-132 than it does at a lower power level. So I load to those levels and have plenty of elbow room to meet PF.