13 January 2018

Wait That's Not Right

Sectional density should be mass/area.

Sectional density for bullets is weight / bullet diameter squared.

So the area of a 9mm is 0.126736 using the ballistic sectional density formula instead of 0.09954?

The area of a square with the bullet diameter is what is being calculated, not the area of circle.

I think we've hit a rule of thumb again.

So our 115gr bullet has a ballistic sectional density of 0.13 or an engineering sectional density of 0.165...

It makes one wonder what happened.


The Wikipedia article on Sectional Density appears to have been written by someone for whom English is a second language.

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