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.

Related:

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

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