Sectional density is a measure of the ratio of .300 Winchester magnum the diameter of a projectile to its mass. All different matters same, a heavier projectile of a given quality could be longer and therefore have a higher sectional density and therefore penetrate deeper than projectiles with a decrease mass and sectional density. As an example, one hundred fifty grain and one hundred seventy five grain .284″ bullets have sectional densities of .266 and .310 respectively. This compares favorably to 150 grain and one hundred eighty grain .308″ bullets which have sectional densities of .226 and .271 respectively.
At the same time, at the same time as the 7mm Rem Mag tops out with 175 grain bullets, the .300 Win Mag is able to firing two hundred grain, 208 grain, and 220 grain bullets with sectional densities of .301, .313, and .331 respectively.
All that being said, the 7mm Rem Mag nevertheless has a mild facet with maximum bullets in commonplace use, even if as compared to heavier .30 quality bullets. For instance, the 150gr Barnes TTSX and 168gr Nosler AccuBond Long Range bullets in 7mm Rem Mag have G1 ballistic coefficients of .450 and .631 respectively whilst the 165gr TTSX and 190gr Nosler AccuBond Long Range in .Three hundred Win Mag have ballistic coefficients of .442 and .597.
The .300 Win Mag does have slightly less bullet drop and carries greater energy down variety. This is due in large part to the truth that the cartridge makes use of heavier bullets and has more case potential. However, for the reason that 7mm Mag bullets compared above have a slightly higher ballistic coefficient, the gap in kinetic energy between the two bullets closes slightly at longer degrees.
