Sorry for the newbie question...
I am looking at purchasing a single port compensated 9mm pistol and have read that I want to be around 140 power factor for the single port comp to be effective.
I am currently loading 124 grain jacketed with 4.3 grains of Alliant Sport Pistol. With this load, I am getting about 135 power factor (average speed around 1085 to 1090).
Alliant chart said I can go up to 4.7 grains for a +P load with Sport Pistol. I am sure that if I go to +P load at 4.7 grain, I will be at or above 140 power factor.
I have he