Sectional Density

For comparison a 308 bullet would need a 218 grain bullet to match the 160gr 6 5mm bullet s sectional density or 190 grains to match the 140gr bullet.

Sectional density. 287 or 160 grain bullets sectional density. Sectional density sd is the ratio of a bullet s weight to the square of its diameter. Generally speaking the larger a bullet s sectional density the.

Sectional density a bullet s weight in pounds divided by its diameter squared describes a bullet s length for its diameter. Sectional density according to the speerreloading manual no. All bullets of the same caliber and weight will have the same sd regardless of their shape or composition.

One of the most important aspects about bullets in terms of performance is sectional density and it happens to be one of the attributes hardly anyone pays attention to sectional density is the greatest predictor of penetration ability which is a key component of ammunition performance. It conveys how well an object s mass is distributed by its shape to overcome resistance along that axis. The higher the number the longer the bullet.

This site uses cookies to give you the best most relevant experience. Sectional density is defined as a bullet s weight mass divided by its cross sectional area. Sectional density sd is the numerical result of a calculation that compares a bullet s weight to its diameter.

Sectional density is used in gun ballistics in this context it is the ratio of a projectile s weight often in either kilograms grams pounds or grains to. Do the math and the resulting number is called the bullet s sectional density or sd. The higher the sd number the better the sd and the heavier a bullet is in proportion to its diameter.

13 is defined as. By continuing to browse the site you are agreeing to our use of cookies. Sectional density often abbreviated sd is the ratio of an object s mass to its cross sectional area with respect to a given axis.