Steve HallenbeckDispersion: The Missing FactorIn theory, MPBR can allow for some shockingly effective distances with flat-shooting cartridges using high-B.C. Notice the difference between theoretical MPBR and 2-MOA precision MPBR numbers:220 Swift: 45 yards25 WBY RPM: 39 yards308 Win. : 32 yardsThe flatter-shooting cartridges show a greater difference between calculated max-point-blank range and the effective MPBR considering 2-MOA of dispersion. Flatter cartridges do extend your effective MPBR, but not by as much as you may think. Another option is to simply reduce your MPBR target size so that it’s smaller than the vital area of your quarry.