The biggest distinction among the 2 cartridges is the size and weight of the bullets they hearth even though: the 7mm Remington Magnum makes use of .284″ bullets and 300 Winchester the .300 Winchester Magnum uses .308″ bullets. Everything else being equal, the smaller diameter 7mm bullets have a better ballistic coefficient and a better sectional density than the bigger diameter bullets of the equal weight from the .300 Winchester Magnum. However, the .Three hundred Winchester Magnum commonly makes use of heavier bullets than the 7mm Remington Magnum.
For example, the vast majority of 7mm Rem Mag manufacturing facility loads shoot bullets inside the 139-a hundred seventy five grain range. Of those, one hundred forty grain, one hundred fifty grain, one hundred sixty grain, and a hundred seventy five grain masses are through far the most common.
On the other hand, maximum .Three hundred Win Mag manufacturing unit loads use bullets inside the 150-230 grain variety. 150 grain, one hundred sixty five grain, a hundred and eighty grain, one hundred ninety grain, 200 grain, and 220 grain bullets are the maximum famous.
Sectional density is a measure of the ratio of 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.