twist rates and ballistics

Interesting - I was working with a company over here, CheyTac,
I think. They make sniper rifles.
And the way they engineered it was by engineering the rifle around ballistics. So they engineered a new cartridge
http://cheytac.com/ammunition/408419-gr-cartridge/

+ slow down the spin giving the bullet greater accuracy at range.
The rest of the rifle followed. They claim effective ranges over 2500 meters. Unfortunately it is not a NATO standard round.
http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi
 
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