[2021] -7% dispersion vs Sigma?

Dispersion - The total elliptical area in which a shell can land.
Sigma - the likelihood that the shell will land closer to the center of the ellipse.
High Dispersion / High Sigma - Tightly grouped shells with a few "wtf is that one over there" (Republique, Agir )
Low Dispersion / High Sigma - Tightly grouped shells that almost never miss (Stalingrad, Siegfried)
Low Sigma / High Dispersion - Scattered Shells across a large area "Short Barreled Shotgun" (Pommern / Kansas / Vittorio Veneto)