Fictional 6mm bullet

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Roboss

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In some kind of fictional scenario if I wanted to create a bullet of 6mm diameter(5.8 bore) and wanted the bullet to be streamlined and with relatively high ballistic coefficient, what is the minimum amount of weight that such a bullet could be. Also how long would it be.

Same question for bullets of 5mm and 5.5mm diameter.

Weird question I know but I have some small ideas of a fanfic but I dont want to necessarily use the same bullets as in real life.

Is there some kind of bullet diameter to weight ratio calculator or something?
 
Theres a great deal of variables that go into bullet design that may change depending on what you are trying to simulate.
The easiest way to make a " custom" bullets is probably turning brass rod on a lathe, that would mean for a given weight, your likely to end up with a longer bullet, as compared to a cup n core etc.
If you decide you want to do something like a tungsten penetrator, or other fancy core, it will effect the other stuff as well.

So perhaps give us an idea of what you want your bullet to accomplish?
 
Look at Berger's website for an idea on what it takes.

I for one would want to see the 112 gr steel jacketed RN FMJ from the 6mm Lee Navy resurrected with some modern tweaks.
 
The highest BC 5.56 bullet I have seen was a 90gr match bullet.
You want long, heavy, pointy, with a boat tail and being a big bore helps.
 
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And you can increase the BC just by cutting the metplat and pointing. Of course Sierra now offers Cut and Pointed Match Projectiles in 6mm and 6.5mm.

Bob
 
Roboss said:
if I wanted to create a bullet of 6mm diameter(5.8 bore) and wanted the bullet to be streamlined and with relatively high ballistic coefficient, what is the minimum amount of weight that such a bullet could be. Also how long would it be.
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Weight and length are oppositional when using common materials for construction; a lightweight and long bullet would need to be made of something far less dense than lead, for example. In exchange, it would likely possess lesser terminal effects. The current lowest-drag 6mm bullets all seem to be just under 1.5" in length.
 
Ballistic coefficient is the dividend of Sectional Density and Form Factor. Sectional Density, of course, is proportionate to weight and inversely to the square of caliber, and Form Factor naturally is correlated to the lengths of the ogive and boattail - longer and sleeker is better...

Such...

A long and sleek, but light weight bullet (for example, polymer tipped solid copper bullets, will NOT have a high ballistic coefficient relative to its length - it will have a good form factor, but a low sectional density. Can’t have one without the other. You need weight AND an aerodynamic profile, so a high density core, and a long and sleek profile are needed to drive high BC’s.
 
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